Vibro-Meter ® VM600 IOC4T input/output card

From the Vibro-Meter® product line

• Signal interface card with 4 dynamic signal 

inputs and 2 tachometer (speed) inputs, for the 

MPC4 machinery protection card

• Screw-terminal connectors (48 terminals) for all 

input/output connections

• Contains 4 relays which can be attributed to 

alarm signals, under software control

• 32 fully-programmable open-collector outputs 

(jumper selectable) to IRC4 and RLC16 relay 

cards

• Buffered “raw” sensor signals and analog 

output signals (voltage or current) for vibration 

channels

• EMI protection for all inputs and outputs

• Live insertion and removal of cards 

(hot-swappable)

• Available in “standard” and “separate circuits” 

versions

DESCRIPTION

IOC4T card

The IOC4T input /output card acts as a signal 

interface for the VM600 series MPC4 machinery 

protection card, from Meggitt’s Vibro-Meter®

product line. It is installed in the rear of a VM600 

rack and connects directly to the rack backplane 

via two connectors.

Each IOC4T card is associated with a 

corresponding MPC4 card and is mounted 

directly behind it in the VM600 rack (ABE04x or 

ABE056). The IOC4T operates in slave mode and 

communicates with the MPC4, through 

connector P2, using an Industry Pack (IP) 

interface.

The front panel of the IOC4T (rear of the VM600 

rack) contains terminal strip connectors for wiring 

to the transmission cables coming from 

measurement chains (sensors and /or signal 

conditioners). The screw-terminal connectors are 

also used to input all signals from and output all 

signals to any external control system. 

The IOC4T card protects all inputs and outputs 

against electromagnetic interference (EMI) and 

signal surges and also meets electromagnetic 

compatibility (EMC) standards.

The IOC4T connects the raw dynamic (vibration) 

and speed signals from the sensors to the MPC4. 

These signals, once processed, are passed back 

to the IOC4T and made available on the terminal 

strip on its front panel (rear of VM600). For the 

dynamic signals, four on-board digital-to-analog 

converters (DACs) provide calibrated signal 

outputs in the range 0 to 10 V. In addition, four onboard voltage-to-current converters allow the 

signals to be provided as current outputs in the 

range 4 to 20 mA (jumper selectable).

The IOC4T contains four local relays that can be 

attributed to any specific alarm signals under 

software control. For example, these may be used 

to signal an MPC4 fault or a problem detected by 

a common alarm (Sensor OK, Alarm and Danger) 

in a typical application.

In addition, 32 digital signals representing alarms 

are passed to the rack backplane and may be 

used by optional RLC16 relay cards and / or IRC4 

intelligent relay cards mounted in the rack 

(jumper selectable).

Applications information

When used as a card pair with an MPC4 

machinery protection card, the IOC4T is highly 

suitable for machinery monitoring and protection 

in a wide range of industrial applications.

For further information on the use of MPC4/IOC4T 

card pairs in general, refer to the 

VM600 machinery protection system (MPS) 

hardware manual and the VM600 MPSx software 

manuals. For information on the use of

MPC4/IOC4T card pairs in functional safety 

contexts, refer to the refer to the VM600 

functional safety manual.

For specific applications, contact your local 

Meggitt representative.

Dynamic signal inputs

Filtering : Filtered for protection against electromagnetic interference 

(conforms to EC standards).

Refer to the VM600 MPC4 machinery protection card data sheet 

for further information.

Buffered dynamic signal outputs

Filtering : Filtered for protection against electromagnetic interference 

(conforms to EC standards).

Refer to the VM600 MPC4 machinery protection card data sheet 

for further information.

Speed/phase reference inputs

Filtering : Filtered for protection against electromagnetic interference 

(conforms to EC standards).

Refer to the VM600 MPC4 machinery protection card data sheet 

for further information.

Discrete signal interface (DSI) inputs

Control signal

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

(clears) the alarms latched by the MPC4/IOC4T card pair.

Note: The alarm reset input (DSI AR) is edge-sensitive and a high-tolow transition is required to activate the reset.

• Danger bypass (DB) : A closed contact between the DSI DB and DSI RET inputs inhibits 

(bypasses) the danger relay outputs

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

the alarm levels by a scale factor (software configurable), to 

enable adaptive monitoring.

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

Alarm outputs

Alarm relays : 4 per IOC4T card.

The MPC4 card can drive the four local relays on the IOC4T card, 

as well the relays on RLC16 relay cards and/or IRC4 intelligent relay