MEGGITTVM600Mk2 MPC4Mk2 + IOC4Mk2 machinery protection and condition monitoring module

KEY FEATURES AND BENEFITS

• VibroSight® compatible hardware from the 

vibro-meter® product line

• VM600Mk2 (second generation)

machinery protection and condition 

monitoring module

• 4 dynamic channels and 2 auxiliary channels 

configurable as either tachometer inputs or 

DC inputs

• VM600Mk2 system safety-line to drive all system 

relays to a safe state

• Diagnostics (built-in self-test (BIST)) provides 

continuous feedback on the health of the 

module

• Individually configurable inputs (with sensor 

power supply outputs), channel filters, 

processing and outputs – with simultaneous 

data acquisition (fixed frequency or 

order tracking)

• High-resolution spectra (FFT) for condition 

monitoring: up to 6400 lines every 100 ms

• Up to 10 processed outputs per channel

• Multiple alarms per processed output with 

configurable limits, hysteresis and time delay

KEY BENEFITS AND FEATURES (continued)

• AND, OR and majority voting logic functions 

for the combination of alarm and status 

information

• Discrete outputs: 4 user-configurable relays for 

use by alarms and 1 status relay

• Analog outputs: 4 outputs configurable as 

either 4 to 20 mA or 0 to 10 V

• Conforms to API 670

• Direct system Ethernet communications

• Compatible with VM600Mk2 system racks 

(ABE04x) and slimline racks (ABE056)

KEY BENEFITS AND FEATURES (continued)

• Live insertion and removal of modules 

(hot-swappable) with automatic 

reconfiguration

• Software configurable

• Front-panel status indicators (LEDs)

APPLICATIONS

• VM600Mk2 machinery protection (MPS) and/or 

condition monitoring (CMS)

• Vibration and/or combustion monitoring

• API 670 applications

DESCRIPTION

Introduction

The VM600Mk2 MPC4Mk2 + IOC4Mk2 machinery 

protection and condition monitoring module is 

designed for operation with the second 

generation of VM600Mk2 rack-based machinery 

protection system (MPS), from Meggitt’s 

vibro-meter® product line. The VM600Mk2

MPC4Mk2 + IOC4Mk2 module consists of 

processing and input/output (interface) modules 

that provide 4 dynamic and 2 auxiliary channels 

of machinery protection and optional condition 

monitoring in VM600Mk2 systems.

VM600Mk2 rack-based monitoring systems

The vibro-meter® VM600Mk2 rack-based 

monitoring system is the evolution of Meggitt’s 

solution for the protection and monitoring of 

rotating machinery used in the power generation 

and oil & gas industries. VM600Mk2 solutions are 

recommended when a centralised monitoring 

system with a medium to large number of 

measurement points (channels) is required. It is 

typically used for the monitoring and/or 

protection of larger machinery such as gas, 

steam and hydro turbines, and generators, 

smaller machines such as compressors, fans, 

motors, pumps and propellers, as well as balanceof-plant (BOP) equipment.

A VM600Mk2 system consists of a 19" rack, a rack 

power supply and one or more monitoring 

modules. Optionally, relay modules and rack 

controller and communications interface 

modules can also be included.

Two types of rack are available: a VM600Mk2

system rack (ABE04x, 6U) that can house up to 

twelve monitoring modules, and a VM600Mk2

slimline rack (ABE056, 1U) that can house one 

monitoring module. The racks are typically 

mounted in standard 19" rack cabinets or 

enclosures installed in an equipment room.

Different VM600Mk2 monitoring modules are 

available for machinery protection, condition 

monitoring and/or combustion monitoring 

applications. For example, the 

MPC4Mk2 + IOC4Mk2 module supports both 

machinery protection and condition monitoring, 

the XMV16 + XIO16T module supports extended 

condition monitoring for vibration and the 

XMC16 + XIO16T module supports extended 

condition monitoring for combustion.

Note: For the MPC4Mk2 + IOC4Mk2 machinery 

protection and condition monitoring module, the 

machinery protection functionality is available by 

default, while the condition monitoring 

functionality is optional and depends on the 

purchased VibroSight® software license.

The RLC16Mk2 relay module is an optional module 

used to provide additional relays when the four 

user-configurable relays per MPC4Mk2 + IOC4Mk2

module are not sufficient for an application.

The CPUMMk2 + IOCNMk2 rack controller and 

communications interface module is an optional 

module used to provide additional VM600Mk2

system functionality such as fieldbus 

communications; module data aggregation, 

processing and sharing; rack and/or fieldbus 

communications redundancy; front-panel alarm 

reset (AR); MPS rack (CPUx) security; system event 

and measurement event logging.

VM600Mk2 rack-based monitoring systems 

complement the VibroSmart® distributed 

monitoring systems that are also available from 

Meggitt’s vibro-meter® product line, and are 

compatible with the same VibroSight® machinery 

monitoring software suite.

MPC4Mk2 + IOC4Mk2 module and VM600Mk2 racks

A MPC4Mk2 + IOC4Mk2 machinery protection and 

condition monitoring module is used as part of a 

VM600Mk2 rack-based monitoring system. The 

MPC4Mk2 + IOC4Mk2 module can be used in a 

VM600Mk2 system rack (ABE04x) or slimline rack 

(ABE056).

The MPC4Mk2 module is always used with an 

associated IOC4Mk2 module as a pair/set of 

modules. Both the MPC4Mk2 and the IOC4Mk2 are 

single-width modules that occupy a single 

VM600Mk2 rack slot (module position). The 

MPC4Mk2 is installed in the front of a VM600Mk2

rack and the associated IOC4Mk2 is installed in the 

rear of the rack, in the slot directly behind the 

MPC4Mk2. Each module connects directly to the 

rack’s backplane using two connectors.

Note: The MPC4Mk2 + IOC4Mk2 module is 

compatible with all VM600Mk2 racks (ABE04x 

system racks and ABE056 slimline racks) and later 

VM600 racks.

System communications

In a VM600Mk2 system (one or more 

MPC4Mk2 + IOC4Mk2 modules and any associated 

RLC16Mk2 modules or CPUMMk2 + IOCNMk2

module), the main communications interface is 

the LAN (Ethernet) connector on the front panel 

of each MPC4Mk2 module, which is used for used 

for communication with the VibroSight® software 

running on an external computer.

In a VM600Mk2 rack (ABE4x), the VME bus can be 

used to share information between modules in 

the rack. For example, an MPC4Mk2 + IOC4Mk2

module can provide information such as 

measurement, alarm and/or status data to a 

CPUMMk2 + IOCNMk2 module which can then 

share the information via one of its industry 

standard fieldbuses.

In a VM600Mk2 system (one or more 

MPC4Mk2 + IOC4Mk2 modules and any associated 

RLC16Mk2 modules or CPUMMk2 + IOCNMk2

module), the RLC16Mk2 modules are controlled 

and operated by a MPC4Mk2, as determined by 

the configuration. The VM600Mk2 rack’s Open 

collector (OC) bus and Raw bus are used to 

exchange control and status information 

between the MPC4Mk2 + IOC4Mk2 and RLC16Mk2

modules.

Relays

The MPC4Mk2 + IOC4Mk2 module includes five 

relays. The four user-configurable relays (RL1 to 

RL4) can be used by a VM600Mk2 system to 

remotely indicate system alarm and/or status 

information. While, a status (common circuit-fault 

relay (FAULT)) is used to indicate a problem with 

the MPC4Mk2 + IOC4Mk2 module, as detected by 

the module’s internal diagnostics (BIST).

The relays in a VM600Mk2 system (one or more 

MPC4Mk2 + IOC4Mk2 modules and any associated 

RLC16Mk2 modules), are driven by control circuitry 

that supports a VM600Mk2 system safety-line, that 

is, a system-wide control signal that automatically 

drives all system relays (IOC4Mk2 and RLC16Mk2) 

and analog outputs (IOC4Mk2) to a safe state 

should a problem be detected. In this way, 

IOC4Mk2 and RLC16Mk2 relays configured as 

normally energised (NE) can always be deenergised in the event of a problem with one of 

the components of the relay coil control signal.

Note: This supports the “de-energise to trip 

principle” required in safety-related applications.

Software

The VibroSight® software supports the 

configuration and operation of VM600Mk2

modules, including the storage, display and/or 

further processing of MPC4Mk2 data for analysis. 

For example, measurements (dynamic or static) 

can be logged to a VibroSight Server data 

repository and/or displayed in the 

VibroSight Vision software.

More specifically, MPC4Mk2 + IOC4Mk2 modules 

are software configured using the VibroSight®

software. To prioritise machinery protection 

functionality and help meet stringent 

cybersecurity and API 670 requirements, the 

MPC4Mk2 + IOC4Mk2 module segregates 

machinery protection (MPS) and condition 

monitoring (CMS) functionality by running 

separate module firmware using separate 

configurations from different VibroSight 

configuration software:

• VibroSight Protect supports the configuration 

and operation of machinery protection system 

(MPS) functionality for a VM600Mk2 system (that is, 

for MPC4Mk2 + IOC4Mk2, RLC16Mk2 and 

CPUMMk2 + IOCNMk2 modules).

• VibroSight Capture supports the configuration 

and operation of condition monitoring system 

(CMS) functionality for a VM600Mk2 system (that is, 

for MPC4Mk2 + IOC4Mk2 modules).

Other VibroSight software modules support 

operations such as data display and analysis 

(VibroSight Vision), data logging and postprocessing (VibroSight Server) system 

maintenance (VibroSight System Manager), etc.

The VibroSight Vision plot catalogue includes 

static plots such as Bar chart, Spider, Table, Trend, 

Bode, Polar, Correlation and Shaft Centerline, 

and dynamic plots such as Waveform, 

Long Waveform, Polar Waveform, Orbit, Corbit, 

Spectrum and Full Spectrum, Waterfall/Cascade, 

and Full Waterfall/Cascade.

More generally for extended condition monitoring 

system (CMS) applications, the VibroSight 

software supports the configuration and 

operation of XMx16 + XIO16T modules for 

condition monitoring and/or combustion 

monitoring, including the processing and 

presentation of measurement data for analysis. 

VibroSight is also used to configure and manage 

CPUMMk2 + IOCNMk2 modules.

Refer to the VibroSight® machinery monitoring 

system software data sheet for further information.

VibroSight® / VM600Mk2 MPC4Mk2

condition monitoring licensing

In VibroSight® / VM600Mk2 MPC4Mk2 systems, the 

MPC4Mk2 + IOC4Mk2 module can provide 

machinery protection system (MPS) functionality 

and/or condition monitoring system (CMS) 

functionality, depending on the requirements of 

the application.

For the VM600Mk2 MPC4Mk2 + IOC4Mk2 machinery 

protection and condition monitoring module, 

machinery protection functionality is available by 

default for all versions of the module, while 

condition monitoring functionality is optional. 

Accordingly, MPC4Mk2 condition monitoring can 

be used by either (1) ordering a version of the 

module with condition monitoring enabled or (2) 

ordering and uploading a condition monitoring 

license to a version of the module without 

condition monitoring enabled (using 

VibroSight System Manager).

Note: MPC4Mk2 condition monitoring also requires 

a VibroSight® software edition / license that 

supports condition monitoring.

For example, a VibroSight / VM600Mk2 MPC4Mk2 

system consisting of MPC4Mk2 + IOC4Mk2 modules 

can initially be installed and used as a MPS only. 

Then, CMS functionality can be quickly and easily 

added at any time by upgrading the licenses for 

the MPC4Mk2 + IOC4Mk2 module(s) and for 

VibroSight software, as required.

Applications information

As part of a VibroSight® / VM600Mk2 system, 

MPC4Mk2 + IOC4Mk2 machinery protection and 

condition monitoring modules are ideal for the 

protection and/or condition monitoring of critical 

assets such as gas, steam or hydro turbines and 

other high-value rotating machines in a wide 

range of industrial applications.

For further information, contact your local 

Meggitt representative.

Supported sensors

Currently available : Compatible with a wide range of sensors and measurement chains 

with current (2-wire) or voltage (3-wire) outputs, including the 

following sensors from the Meggitt vibro-meter® product line:

• CAxxx vibration sensors (piezoelectric accelerometers)

• CExxx and PVxxx vibration sensors (piezoelectric accelerometers

and velocity sensors)

• CVxxx and VExxx vibration sensors (velocity sensors)

• CPxxx dynamic pressure sensors (piezoelectric pressure sensors)

• TQxxx proximity sensors

• LSxxx air-gap sensors.

Dynamic inputs

Number of channels : 4 (independent channels)

Voltage inputs

• DC measurement range : 0 to +20 VDC or 0 to −20 VDC.

Note: 10 Hz DC filter (see DC filtering on page 5).

• AC measurement range : ±20 VPEAK-PEAK

• AC + DC measurement range : ±24 VPEAK-PEAK

Common-mode voltage range : −50 to +50 VDC

Common-mode rejection ratio (CMRR) : >55 dB, up to 60 Hz.

>60 dB, from 45 to 65 Hz.

Current inputs

• DC measurement range : 0 to 35 mA

• AC measurement range : ±30 mAPEAK-PEAK

• AC + DC measurement range : ±50 mAPEAK-PEAK

Frequency bandwidth : DC to 20 kHz

Input impedance

• Voltage : ≥100 kΩ, between the differential (high and low) inputs

• Current : 200 Ω ±0.2%

Accuracy

• Amplitude : ±1% of full scale

• Phase : ±1° from 10 Hz to 2 kHz.

±15° from 2 to 20 kHz.

Dynamic input range : ≥80 dB, from 3 Hz to 20 kHz

DC filtering

DC filter

• Cutoff frequency (−3 dB) : 10 Hz ±3.5 Hz

• Roll-off : −40 dB/decade (second order)

Note: The DC filter is used to extract the DC part of a dynamic input when it is configured as a DC input.

High-pass filtering

High-pass filter

• Cutoff frequency (−3 dB) : 0.1, 1 or 3 Hz (or bypassed)

• Roll-off : −20 dB/decade (first order)

• Phase error : <1° at 100 times the cutoff frequency (10, 100 or 300 Hz)

Note: The high-pass filter is used to configure a dynamic input for an AC only input signal with one of 3 different 

cutoff frequencies. This filter can be disabled in order to allow the DC-coupling of the input signal (AC + DC).

Auxiliary inputs

Number of channels : 2 (independent channels)

configurable as either tachometer inputs or DC inputs

Common-mode voltage range : −50 to +50 VDC

Common-mode rejection ratio (CMRR) : >50 dB, up to 60 Hz.

>55 dB, from 45 to 65 Hz.

Tachometer input

• Triggering method : Crossing of threshold on rising edge or falling edge of signal

• Triggering threshold : 2/3 of peak-peak value ±10% for rising edge.

1/3 of peak-peak value ±10% for falling edge.

• Tachometer pulse acquisition/

detection (on input)

: Up to 51.2 kHz.

• Speed / frequency measurement 

range

: 1 to 100000 RPM / 0.01667 to 1666.67 Hz.

Note: Configurable tacho divider of 1 to 255 (pulses per revolution).

• Voltage range : 0.6 to 50 VPEAK-PEAK from 2 Hz to 10 kHz.

2 to 50 VPEAK-PEAK from 10 kHz to 50 kHz.

Auxiliary input

• Current range input : ±50 mAPEAK-PEAK (AC + DC measurement range)

• Voltage range input : ±50 VPEAK-PEAK

DC input

• Voltage measurement range : 0 to +20 VDC or 0 to −20 VDC.

Note: 10 Hz DC filter (see DC filtering on page 6).

• Current measurement range : ±50 mAPEAK-PEAK (AC + DC input)

Input impedance

• Voltage : ≥100 kΩ, between the differential (high and low) inputs

• Current : 200 Ω ±0.2%

Dynamic input range : ≥72 dB

DC filtering

DC filter

• Cutoff frequency (−3 dB) : 10 Hz ±3.5 Hz

• Roll-off : −40 dB/decade (second order)

Note: The DC filter is used to extract the DC part of an auxiliary input when it is configured as a DC input.

Sensor/measurement chain OK check

Number of levels : Up to 16 configurable threshold levels (16 DC regions)

OK level range

• Voltage inputs : ±20 VDC

• Current inputs : 0 to 23 mA

Operating principle

• SIL safety sensors : Line-fault detection of conditions such as a problem with the sensor 

and/or cabling, problem with the signal conditioner, and/or other 

problem with the measurement chain or power supply.

Note: Requires a SIL safety sensor/measurement chain that 

provides a suitable diagnostic signal (DC bias level), for example, 

measurement chains using IPC707 or IQS900 signal conditioners.

• Standard sensors : Powered sensors – line-fault detection of conditions such as

open-circuit or short-circuit.

Unpowered sensors – line-fault detection of conditions such as

open-circuit.

Digital signal processing

Analogue to digital converter (ADC) : 24 bit

Dynamic range : ≥80 dB

Frequency bandwidth : 0 Hz to 20 kHz

Accuracy

• Amplitude : ≤1% of input full scale

• Phase : ≤1.5°

Digital filtering

• Notch filter : 50 or 60 Hz

• ISO 2954 filter : 10 Hz to 1 kHz (−3 dB), −24 dB/octave

• Band-pass filter : <0.1 dB ripple in pass band, >55 dB attenuation in stop band,

0.1 or 3 dB attenuation at cutoff, −24 to −60 dB/octave slope

• High-pass filter : 0.25 to 400 Hz

• Low-pass filter : 10 Hz to 20 kHz

Data acquisition : Fixed frequency or order tracking

Fixed frequency : Frequency span: 0.25 Hz to 20 kHz.

Note: The low-pass filter (LPF) cutoff frequency to high-pass filter 

(HPF) cutoff frequency ratio must be less than 400 when the HPF 

cutoff frequency is less than 3 Hz. See also Digital filtering above.

Order tracking : Digital resampling.

Tracking range: 300 to 6000 RPM (default).

Frequency span: DC to 3.125, 6.25, 12.5, 25, 50 or 100 orders.

Waveform averaging: 1 (default).

Note: Order tracking requires a reference speed (auxiliary input 

configured as a tacho/speed channel).

Measurement resolution : 2 048, 4096, 8192 or 16384 point waveform /

800, 1600, 3200 or 6400 line spectrum

FFT window types : Blackman, Blackman-Harris, Flat top, Hamming, Hanning, 

Kaiser α=1, Kaiser α=5, Kaiser α=10, Rectangular or Tukey α=0.5.

Note: Hanning is the default window type.

FFT resolution : 800, 1600, 3200 or 6400 spectral lines

Data sampling rate : 2.56 × frequency bandwidth

Extracted data (measurements) : Up to 10 processed outputs per channel/processing function.

See Processing functions on page 10.

Extracted data types : Time domain measurements: Scalar.

Frequency domain measurements: Scalar, Vector and Phasor.

Fixed-frequency measurements : Time domain or Frequency domain measurements.

Time domain measurements: Overall (Scalar).

Frequency domain measurements:

Single frequency – nX (Amplitude + Phase (Vector)),

Band – Band start to Band stop (Amplitude (Scalar)),

Highest peak – Band start to Band stop (Amplitude + Phase 

+ Frequency (Phasor)).

Order-tracking measurements : Frequency domain measurements only.

Frequency domain measurements:

Single frequency – nX (Amplitude + Phase (Vector)),

Band – Band start to Band stop (Amplitude (Scalar)),

Highest peak – Band start to Band stop (Amplitude + Phase 

+ Frequency (Phasor)).

Integration count : 0, 1 or 2 (Acceleration to Velocity or Displacement), as required

Measurement types : Time domain measurements: True RMS, True Peak, True Peak-peak, 

True Average.

Frequency domain measurements: Amplitude + Phase (Vector).

Note: True RMS and True average measurements have a 

configurable Response time (400 ms default). True Peak and 

True Peak-peak measurements have a configurable Decay time 

(4700 ms default).

Qualifiers (rectifiers) : Time domain measurements: True RMS, True Peak, True Peak-peak, 

True Average, Scaled Peak, Scaled Peak-peak or Scaled Average.

Frequency domain measurements: RMS, Peak, Peak-peak or 

Average.

Update rate – internal

(MPC4Mk2 module)

: 20 ms min. for time domain processing.

100 ms min. for frequency domain processing.

Note: MPC4Mk2 + IOC4Mk2 and RLC16Mk2 relays are also updated 

every 20 ms.

Update rate – external

(VibroSight Capture condition 

monitoring data update rate) 

: Configurable as 100 ms, 200 ms, 500 ms, 1 s, 2 s or 5 s.

Note: 1 s is the default VibroSight Capture condition monitoring 

update rate.

Update rate – external

(VibroSight Capture condition 

monitoring data logging rule rate) 

: Configurable between 100 ms and 99 days

Update rate – external

(VibroSight Vision live data 

display interval)

: Configurable as 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, 20 s, 50 s, …

Machinery protection system (MPS) functionality / processing

Measurement resolution

(fixed)

: 2048 point waveforms / 800 line spectra

Notes

The lower-resolution waveforms and spectra available from MPC4Mk2 + IOC4Mk2 modules configured for and 

running machinery protection only are intended to support the configuration, verification and troubleshooting 

of sensor / measurement chains.

VibroSight Vision uses a direct connection to a module in order to display these plots.

Firmware : Machinery protection firmware (640-025-vvv-ppp) running on the 

module (MPC4Mk2)

Configuration : Machinery protection configuration stored on the module 

(IOC4Mk2)

MPS functionality / licensing : Machinery protection (MPS) functionality is available by default

Condition monitoring system (CMS) functionality / processing

Measurement resolution

(user-configurable)

: 4096, 8192 or 16384 point waveforms /

1600, 3200 or 6400 line spectra

Waveform frequency span : 0 or 0.25 to 156.25, 312.5, 625, 1250, 2500, 5000, 10000 or 20000 Hz

Spectra resolution : 1600 line spectra: 0.1, 0.2, 0.39, 0.78, 1.56, 3.13, 6.25 or 12.5 Hz.

3200 line spectra: 0.05, 0.1, 0.2, 0.39, 0.78, 1.56, 3.13 or 6.25 Hz.

6400 line spectra: 0.02, 0.05, 0.1, 0.2, 0.39, 0.78, 1.56 or 3.13 Hz.

Spectra averaging : Yes: 1 to 100 / RMS, Peak hold or Mean

Measurement averaging : Yes: 1 to 100

Notes

The higher-resolution waveforms and spectra (and other plot types) available from MPC4Mk2 + IOC4Mk2

modules configured for and running condition monitoring are intended to support the display and analysis of 

dynamic measurement data for the purposes of condition monitoring.

VibroSight Vision typically uses a connection to a VibroSight Server in order to display such live and/or historical 

waveforms and spectra (and all other plot types).

Firmware : Condition monitoring firmware (640-033-vvv-ppp) running on the 

module (MPC4Mk2)

Configuration : Machinery protection configuration stored on the associated 

VibroSight Server

CMS functionality / licensing : Condition monitoring (CMS) functionality is optional and can be 

used by either:

(1) ordering a version of the MPC4Mk2 module with condition 

monitoring enabled

or

(2) ordering and uploading a MPC4Mk2 CMS license to a version of 

the MPC4Mk2 module without condition monitoring enabled.

See Ordering information on page 23 for further information.

Notes

For condition monitoring, the waveforms / spectra resolution and update rates are user-configurable, so the 

VibroSight Protect software automatically checks the configured processing load and will issue a warning if 

resolutions and/or update rates must be reduced.

For example, a MPC4Mk2 + IOC4Mk2 module can typically provide a maximum of two to four 6400 line spectra 

at 100 ms, depending on the required filter coefficients.

Processing functions

The following configurable signal processing blocks and measurements are supported by the 

MPC4Mk2 + IOC4Mk2 module:

Single-channel processing

Bearing absolute vibration:

• Dynamic channels only – with accelerometers or velocity sensors

• Fixed-frequency or order-tracking data acquisition

• Band-pass or ISO 2954 filtering

• Waveform and spectrum

• Up to 10 measurements for fixed-frequency data acquisition: up to 6 time-domain measurements (2 direct 

and 2 per integration level) and up to 4 frequency-domain measurements

• Up to 6 measurements for order-tracking data acquisition: up to 2 time-domain measurements (2 direct) and

up to 4 frequency-domain measurements.

Combustion dynamics:

• Dynamic channels only – with pressure sensors

• Fixed-frequency data acquisition

• Band-pass and notch (50 or 60 Hz) filtering

• Waveform and spectrum

• Up to 6 measurements for fixed-frequency or order-tracking data acquisition:

up to 2 time-domain measurements and up to 4 frequency-domain measurements.

Shaft relative vibration:

• Dynamic channels only – with proximity sensors

• Fixed-frequency or order-tracking data acquisition

• Band-pass filtering

• Waveform and spectrum

• Up to 6 measurements for fixed-frequency or order-tracking data acquisition:

up to 2 time-domain measurements and up to 4 frequency-domain measurements (AC displacement)

• 1 quasi-static measurement (DC gap / position).

Note: Shaft relative vibration processing outputs include both dynamic (AC) and quasi-static (DC) 

components.

Shaft eccentricity:

• Dynamic channels only – with proximity sensors

• 1 quasi-static measurement (eccentricity).

Air gap:

• Dynamic channels only – with air-gap sensors

• Fixed-frequency data acquisition

• Rotor shape and rotor signature waveforms with associated measurements (min. gap, max. gap, avg. gap, 

rotor eccentricity, rotor circularity and rotor ellipticity)

• 1 air gap measurement (min. gap).

Custom dynamic:

• Dynamic channels only – with other/custom sensors

• Fixed-frequency or order-tracking data acquisition

• Band-pass or ISO 2954 filtering

• Waveform and spectrum

• Up to 10 measurements for fixed-frequency or order-tracking data acquisition:

up to 4 time-domain measurements and up to 6 frequency-domain measurements

• 1 quasi-static measurement (DC).

Note: Custom dynamic processing outputs include both dynamic (AC) and quasi-static (DC) components

Position:

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (position / DC gap).

Note: Position processing is equivalent to Shaft relative vibration processing’s quasi-static (DC) component.

Shaft axial position (collar method and shaft-end method):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (axial position).

Rotor position (collar):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (position).

Differential expansion (collar method and pendulum method):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (differential expansion).

Rotor expansion (collar method and pendulum method):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (rotor expansion).

Quasi-static pressure:

• Dynamic or auxiliary channels – with pressure sensors

• 1 quasi-static measurement (pressure).

Quasi-static temperature:

• Dynamic or auxiliary channels – with temperature sensors

• 1 quasi-static measurement (temperature).

Housing expansion:

• Dynamic or auxiliary channels – with LVDT type sensors

• 1 quasi-static measurement (expansion).

Custom quasi-static:

• Dynamic or auxiliary channels – with other/custom sensors

• 1 quasi-static measurement (DC).

Speed:

• Auxiliary channels only (tachometers) – with speed/tacho sensors (for example, proximity sensors)

• 1 speed measurement for a single-shaft with configurable tacho ratio

• 2 speed measurements for a dual-shaft with individually configurable tacho ratios.

Note: Speed processing for dual-shafts supports machines such as gearboxes, belts, chains, pulleys, etc.

Notes:

In general, the MPC4Mk2 + IOC4Mk2 module supports one processing block – dynamic or auxiliary – per input 

channel.

A maximum of 6 single-channel processing blocks can be configured per MPC4Mk2 + IOC4Mk2 module (that is, 

four for dynamic channels and two for auxiliary channels).

A maximum of 3 dual-channel processing blocks can be configured per MPC4Mk2 + IOC4Mk2 module (that is, 

two for dynamic channels and one for auxiliary channels).

For each processing block, there are 2 to 10 processed outputs (data extractions), depending on the function.

Dual-channel processing

X-Y bearing absolute vibration:

• Dynamic channels only – with accelerometers or velocity sensors

• Fixed-frequency data acquisition

• Band-pass or ISO 2954 filtering

• Orbits – 1 unfiltered overall orbit (OVR orbit) and up to 6 filtered orbits (1X, 2X, etc.)

• Full spectrum – with up to 6 frequency-domain measurements (1X, 2X, Not 1X, etc.)

• 1 time-domain measurement (Vmax).

Note: Vmax can be calculated using the real maximum displacement value directly from the orbit (that is, the 

largest radius from the unfiltered orbit), which is a peak measurement.

Alternatively, Vmax can be calculated using an X-Y max discriminator that uses the maximum value of the 

peak-to-peak displacement values measured in two orthogonal directions of the unfiltered orbit, which is a 

peak-peak measurement.

X-Y shaft relative vibration:

• Dynamic channels only – with proximity sensors

• Fixed-frequency data acquisition

• Band-pass filtering

• Orbits – 1 unfiltered overall orbit (OVR orbit) and up to 6 filtered orbits (1X, 2X, etc.)

• Shaft centerline

• Full spectrum – with up to 6 frequency-domain measurements (1X, 2X, Not 1X, etc.)

• 1 time-domain measurement (Smax).

Note: Smax can be calculated using the real maximum displacement value directly from the orbit (that is, the 

largest radius from the unfiltered orbit), which is a peak measurement (ISO 7919-1 Method C).

Alternatively, Vmax can be calculated using an X-Y max discriminator that uses the maximum value of the 

peak-to-peak displacement values measured in two orthogonal directions of the unfiltered orbit, which is a 

peak-peak measurement (ISO 7919-1 Method B).

Shaft absolute vibration:

• Dynamic channels only – with proximity sensor and accelerometer or velocity sensor

• Fixed-frequency data acquisition

• Band-pass filtering

• Absolute spectrum – with up to 6 frequency-domain measurements (1X, 2X, Not 1X, etc.)

• 1 time-domain measurement (overall).

Shaft axial position (collar method and shaft-end method):

• Dynamic channels only – with proximity sensors

• 1 quasi-static measurement (axial position).

Note: Dual-channel Shaft axial position processing is similar to its single-channel equivalent except that two 

sensors and voting logic (typically 2oo2) are used.

Differential expansion (collar method and dual-taper method and single-taper method):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (differential expansion).

Rotor expansion (collar method and dual-taper method and single-taper method):

• Dynamic or auxiliary channels – with proximity sensors

• 1 quasi-static measurement (rotor expansion).

Delta quasi-static pressure:

• Dynamic or auxiliary channels – with pressure sensors

• 1 quasi-static measurement (differential pressure (mathematical subtraction)).

Delta quasi-static temperature:

• Dynamic or auxiliary channels – with temperature sensors

• 1 quasi-static measurement (differential temperature (mathematical subtraction))

Mathematical function:

• Dynamic or auxiliary channels – any sensors

• 1 mathematically calculated measurement (Sum, Subtraction, RMS Sum, RMS Subtraction, Min or Max).

Differential housing expansion:

• Dynamic or auxiliary channels – LVDT type sensors

• 1 quasi-static measurement (differential expansion (mathematical subtraction)).

Notes:

In general, dual-channel processing requires that both channels are configured for fixed-frequency data 

acquisition and use the same filter (frequency span) settings, such as cutoff frequencies, attenuation and 

slope. However, Mathematical function processing does allow different processing functions to be combined.

Alarm processing

Alarms : Alarm with configurable limits (severity levels), hysteresis and time 

delay per processed output (data extraction)

Time delay : Up to 60 s in steps of 100 ms

Hysteresis : Up to 20% of the alarm level (physical quantity)

Severity levels

• Machinery protection applications : Out of range+, Danger+, Alert+,

Normal,

Alert−, Danger−, Out of range−

• Basic condition monitoring 

applications

: Out of range+, Danger+, Alert+, Information+,

Normal,

Information−, Alert−, Danger−, Out of range−

Adaptive monitoring : Adaptive monitoring uses a control parameter provided by an 

auxiliary channel (typically speed) to multiply the configured alarm 

limits by multiple coefficients configured for different ranges of the 

control parameter.

Trip multiplier uses the DSI TM control signal to multiply the 

configured alarm limits by a single configurable coefficient. 

See Discrete signal interface (DSI) inputs on page 14.

Alarm combination

Logic functions : AND, OR and majority voting logic (1oo2, 2oo2 and 2oo3), with 

optional inversion of individual inputs

Level 1 (basic) logic functions

• Number : 32

• Number of inputs per logic function : 32

• Configurable inputs : Sensor OK checks, measurement alarms (such as Danger+, Alert+, 

Alert− and Danger−) and/or associated data quality indicators 

(status bits)

Level 2 (advanced) logic functions

• Number : 32

• Number of inputs per logic function : 32

• Configurable inputs : Outputs from level 1 (basic) logic functions.

Note: Level 1 (basic) and level 2 (advanced) logic functions can 

be combined to generate more complex logic function.

Alarm update rate (internal) : 100 ms max.

Note: This is the time required for the MPC4Mk2 + IOC4Mk2 module to 

detect and initiate an alarm, including output relay (RL1 to RL4) 

activation.

Discrete signal interface (DSI) inputs

Control signal

• Alarm bypass (AB) : A closed contact between the DSI AB and RET inputs inhibits the 

activation of alarms and relays on the MPC4Mk2 + IOC4Mk2 module.

Note: The common circuit-fault relay (FAULT) is activated when 

Alarm bypass (AB) is enabled.

• Alarm reset (AR) : A closed contact between the DSI AR and RET inputs resets (clears) 

the alarms and relays latched by the MPC4Mk2 + IOC4Mk2 module.

Note: The Alarm reset (AR) input is edge-sensitive and a high-to-low 

transition is required to activate the reset. The Alarm reset (AR) input 

should not be held low and must transition low-to-high before 

another reset (high-to-low) can activate the reset.

• Trip multiply (TM) : A closed contact between the DSI TM and RET inputs multiplies the 

configured alarm levels for the MPC4Mk2 + IOC4Mk2 module by a 

scale factor (software configurable)

Operating principle : Detection of an open circuit or a closed circuit on the input

Buffered outputs – dynamic channels

Number : 4

Type : Buffered outputs (buffered “raw” analog signal).

Buffered analog signals corresponding to dynamic channel input 

channels (CH1 to CH4) are available on BNC connectors on the 

MPC4Mk2 module (front of rack) and on the J2 screw-terminal 

connector on the IOC4Mk2 module (rear of rack).

See Connectors on page 21.

Frequency bandwidth : DC to 60 kHz

Output impedance : <5 Ω

Accuracy

• Amplitude : ± 0.1 dB up to 20 kHz.

± 3 dB from 20 to 60 kHz.

• Phase : <1° from 10 Hz to 2 kHz.

<15° from 2 to 20 kHz.

Transfer ratios

• Voltage input : 1 V/V

• Current input : 0.2 V/mA

Admissible load on output

• Resistance : ≥50 kΩ

• Capacitance : Able to drive up to 3 m of cable with a typical capacitance 

of 100 pF/m

• Impedance : >50 kΩ with a load capacitance <5 nF

Buffered outputs – auxiliary channels

Number : 2

Type : Buffered outputs (buffered “raw” analog signal or TTL-level signal).

Buffered analog signals corresponding to auxiliary input 

channels (AX1 and AX2) are available on BNC connectors on the 

MPC4Mk2 module (front of rack) and on the J2 connector on the 

IOC4Mk2 module (rear of rack).

See Connectors on page 21.

Note: When an auxiliary input is configured as a tachometer input, 

a buffered TTL-level signal corresponding to the auxiliary input 

channel (AX1 or AX2) is available on the J2 connector on the 

IOC4Mk2 module (rear of rack). When an auxiliary input is 

configured as a DC input, no digital TTL-level signal is available.

Frequency bandwidth : DC to 60 kHz

Output impedance

• Buffered TTL-level signal

(tachometer input)

: <300 Ω

• Buffered “raw” analog signal

(DC input)

: <5 Ω

Signal levels : 0 to 5 V TTL-compatible signal (non-inverting)

Admissible load on output

• Resistance : >50 kΩ

• Capacitance : Able to drive up to 3 m of cable with a typical capacitance 

of 100 pF/m

• Impedance : >50 kΩ with a load capacitance <5 nF

Analog outputs

Number of local outputs : 4 single-ended outputs.

Used to output quasi-static measurement signals (DC).

Individually configurable as either current or voltage output signals.

Current outputs

• Range : 4 to 20 mA (nominal).

Two modes of operation are supported, as follows:

• Mode 1, measured value with quality checks – the analog output 

is driven in the 4 to 20 mA signal range during normal operation, 

and the analog output is driven to 2 mA to indicate a problem.

• Mode 2, measured value without quality checks – the analog 

output is driven in the 2 to 23 mA signal range.

Note: Current outputs are 0 mA ± 0.5 mA when disabled.

• Resolution : 10 µA

• Accuracy : ≤1% of full scale

• Admissible load on output : ≤360 Ω.

Note: Compliance voltage is 10 V min.

Voltage outputs

• Range : 0 to 10 V.

Note: Voltage outputs are 0 V ±10 mV when disabled.

• Resolution : 2.5 mV

• Accuracy : ≤1% of full scale

• Admissible load on output : ≥50 kΩ with a load capacitance <5 nF

Update rate / frequency bandwidth : 100 ms / 10 Hz max.

Short-circuit protection : Yes