MEGGITTVM600Mk2 MPC4Mk2 + IOC4Mk2 machinery protection and condition monitoring module

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