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

security, system event and measurement event 

logging, fieldbus communications (Modbus, 

PROFIBUS and/or PROFINET) and/or 

communications redundancy.

Note: Different versions of CPUx/IOCx rack 

controller and communications interface card 

pair support different combinations of VM600 

system functionality.

VM600 rack-based monitoring systems 

complement the VibroSmart® module-based 

distributed monitoring systems that are also 

available from Meggitt’s Vibro-Meter® product 

line.

DESCRIPTION (continued)

CPUM/IOCN card pair and VM600 racks

The CPUM/IOCN card pair is used with a VM600 

ABE04x system rack and a CPUM card can be 

used either alone or with an associated IOCN 

card as a card pair, depending on the 

application/system requirements. 

The CPUM is a double-width card that occupies 

two VM600 rack slots (card positions) and the 

IOCN is a single-width card that occupies a single 

VM600 slot. The CPUM is installed in the front of the 

rack (slots 0 and 1) and an associated IOCN is 

installed in the rear of the rack in the slot directly 

behind the CPUM (slot 0). Each card connects 

directly to the rack’s backplane using two 

connectors.

Note: The CPUM/IOCN card pair is compatible 

with all VM600 ABE04x system racks.

CPUM rack controller and communications 

interface functionality

The modular, highly versatile design of the CPUM 

means that all VM600 rack configuration, display 

and communications interfacing can be 

performed from a single card in a “networked” 

rack. The CPUM card acts as a “rack controller” 

and allows an Ethernet link to be established 

between the rack and a computer running one 

of the VM600 MPSx software packages (MPS1 or 

MPS2).

The CPUM front panel features an LCD display 

that shows information for the CPUM itself and for 

protection cards in a VM600 rack. The SLOT and 

OUT (output) keys on the CPUM front panel are 

used to select which signal to display.

As a fieldbus communications interface for a 

VM600 monitoring system, the CPUM 

communicates with MPC4 and AMC8 cards via 

the VME bus and with XMx16/XIO16T card pairs 

via an Ethernet link in order to obtain 

measurement data and then share this 

information with third-party systems such as a DCS 

or PLC.

LEDs on the CPUM front panel indicate the OK, 

Alert (A) and Danger (D) status for the currently 

selected signal. When Slot 0 is selected, the LEDs 

indicate the overall status of the whole rack. 

When the DIAG (diagnostic) LED shows green 

continuously, the CPUM card is operating 

normally, and when the DIAG LED blinks, the 

CPUM card is operating normally but access to 

the CPUM card is restricted due to VM600 MPS 

rack (CPUM) security.

The ALARM RESET button on the front panel of the 

CPUM card can be used to clear the alarms 

latched by all protection cards (MPC4 and 

AMC8) in the rack. This is a rack-wide equivalent 

of resetting alarms individually for each card using 

discrete signal interface alarm reset (AR) inputs or 

VM600 MPSx software commands.

The CPUM card consists of a carrier board with 

two PC/104 type slots that can accept different 

PC/104 modules: a CPU module and an optional 

serial communications module.

All CPUM cards are fitted with a CPU module that 

supports two Ethernet connections and two serial 

connections. That is, both the Ethernet redundant 

and serial redundant versions of the card.

The primary Ethernet connection is used for 

communication with the VM600 MPSx software 

via a network and for Modbus TCP and/or 

PROFINET communications. The secondary 

Ethernet connection is used for Modbus TCP 

communications. The primary serial connection is 

used for communication with the VM600 MPSx 

software via a direct connection. The secondary 

serial connection is used for Modbus RTU 

communications.

Optionally, a CPUM card can be fitted with a 

serial communications module (in addition to the 

CPU module) in order to support additional serial 

connections. This is the serial redundant version of 

the CPUM card.

The CPUM module’s primary Ethernet and serial 

connections are available via connectors (NET 

and RS232) on the front panel of the CPUM. 

However, if the associated IOCN card is used, the 

primary Ethernet connection can be routed to a 

connector (1) on the front panel of the IOCN 

(instead of the connector on the CPUM (NET)). 

When the associated IOCN card is used, the 

secondary Ethernet and serial connections are 

available via connectors (2 and RS) on the front 

panel of the IOCN.

IOCN card

The IOCN card acts as a signal and 

communications interface for the CPUM card. It 

DESCRIPTION (continued)

also protects all inputs against electromagnetic 

interference (EMI) and signal surges to meet 

electromagnetic compatibility (EMC) standards.

The IOCN card’s Ethernet connectors (1 and 2)