Vibro-Meter ® VM600 CPUM and IOCN modular CPU card and input/output card

packing/unpacking functions, and many supporting functions.

There is also a data freeze detection function that can be used to 

help detect if a data value has stopped being updated.

• Alarm reset : CPUM front-panel button used to manually clear the alarms (and 

relays) latched by MPC4/IOC4T and AMC8/IOC8T card pairs in the 

rack

• VM600 MPS rack (CPUM) security : Used to limit the functionality of a machinery protection system 

(MPS) that is available via the system Ethernet connections of a 

CPUM/IOCN card pair, helping to reduce the possibility of 

interference in the machinery protection function of the rack itself 

and/or in the machinery being monitored

• Event logging : VM600 system event and measurement event logging with up to 

10000 of the most recent events stored on the CPUM (in nonvolatile memory).

Note: System event logs and measurement event logs are 

downloaded from a CPUM using the VM600 MPSx software.

• Status indication : CPUM front-panel LEDs (front of VM600 rack) indicate the mode of 

operation and status of the CPUM card

Communications interface

• VM600 rack (system) 

communications

: Uses a VME communications link for communications with

MPC4/IOC4T and AMC8/IOC8T card pairs (via the VME bus on the 

VM600 rack’s backplane).

Uses a system Ethernet connection for communications with a 

computer running software such as VM600 MPSx.

• Fieldbus communications

(data gateway)

: Acts as a fieldbus server (slave) device that obtains data from 

cards in the VM600 rack (that is, from MPC4/IOC4T and

AMC8/IOC8T card pairs) to share with fieldbus client (master) 

devices such as a DCS or PLC:

• The CPUM can act as a Modbus server and use the fieldbus 

interfaces to share data via Modbus RTU and/or Modbus TCP.

Note: The configuration of the fieldbus interfaces and the definition 

of the data to be shared via fieldbus is defined by a Modbus 

configuration file that is uploaded to the CPUM card using the 

CPUM Configurator software.

Fieldbus interfaces

Number of channels : Multiple fieldbus interfaces (ports).

Ethernet and/or serial: Modbus and/or PROFINET.

Data transfer

• Modbus : Up to 131072 registers/words and 131072 coils/bits total.

That is, up to 2 × 65536 registers/words and 2 × 65536 coils/bits 

(holding and discrete).

• PROFINET : Maximum slot size of 128 bytes.

Note: PROFINET is supported by later versions of the CPUM card 

running firmware version 081 or later.

It was originally only supported by earlier versions of the CPUM card 

running a special PROFINET version of firmware (version 801) that is 

no longer supported.

Contact your local Meggitt representative or Meggitt SA for further 

information.

CPU module (CPUM PC/104 slot 1)

Note: The CPU module is fitted to all versions of the CPUM card.

Module type : PFM-541I or equivalent

Processor type : AMD Geode™ LX800

Processor Speed : 500 MHz

Memory : 256 MB DRAM

Power supply to module (input) : 5 VDC, <1.8 A

Operating system : QNX

Communication interfaces – serial

Number : 2

Primary serial interface

• Network interface : RS-232

• Data transfer rate : Up to 115.2 kBaud

• Network topologies : Point-to-point

• Protocols : Meggitt TCP/IP proprietary protocol for communication with the 

VM600 MPSx software

• Function : VM600 rack configuration and communications using the 

VM600 MPSx software

• Connector : RS232 on CPUM card (see Connectors on page 10)

Secondary serial interface (requires IOCN card)

• Network interface : RS-232 or RS-485 (half-duplex (2-wire) or full-duplex (4-wire))

• Data transfer rate : Up to 115.2 kBaud

• Distance between devices : According to the relevant standard

• Network topologies : Point-to-point for RS-232 links.

Point-to-point or linear (daisy-chained) for RS-485 networks.

• Protocols : Modbus RTU 

• Function : Fieldbus Modbus RTU communications

• Connector : RS on IOCN card (see Connectors on page 10)

• RS-485 (fieldbus) isolation : 500 VDC

Communication interfaces – Ethernet

Number : 2

Primary Ethernet interface

• Network interface : 10/100BASE-TX – Ethernet / Fast Ethernet

• Data transfer rate : Up to 100 Mbps

• Distance between devices : Up to 100 m

• Protocols : Meggitt TCP/IP proprietary protocol for communication with the 

VM600 MPSx software, Modbus TCP and/or PROFINET

• Function : VM600 rack configuration and communications using the 

VM600 MPSx software, fieldbus Modbus TCP communications

and/or fieldbus PROFINET communications

• Connectors : NET on CPUM card or 1 on IOCN card (see Connectors on page 10)

Secondary Ethernet interface (requires IOCN card)

• Network interface : 10/100BASE-TX – Ethernet / Fast Ethernet

• Data transfer rate : Up to 10 Mbps

• Distance between devices : Up to 100 m

• Protocols : Modbus TCP

• Function : Fieldbus Modbus TCP communications

• Connector : 2 on IOCN card (see Connectors on page 10)

Serial communications module (CPUM PC/104 slot 2)

Note: The serial communications module is optional and is only fitted to the serial redundant version of the 

CPUM card.

Module type : AIM104-COM4 or equivalent

Power supply to module (input) : 5 VDC, <220 mA

Isolation : >100 VDC