6 - 2 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
VM600 MPS rack (CPUM) security
CPUM / IOCN CARD PAIR
NOTE: The primary Ethernet connection is used for communication with the VM600 MPSx
software via a network and for Modbus TCP communications. The secondary
Ethernet connection is used for redundant 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 card.
The CPUM card with the optional serial communications module provides:
• RS-485 (115.2 kbps) communications as either half-duplex (2-wire) or
full-duplex (4-wire) via the ‘A’ and ‘B’ connectors (6P6C (RJ11/RJ25)) on the IOCN
card’s panel.
NOTE: The additional ‘A’ and ‘B’ serial connections can be used to configure multi-drop
RS-485 networks of VM600 racks using Modbus RTU communications.
A diagnostic LED (named DIAG) on the panel of the CPUM indicates the CPUM card status,
such as normal operation and whether VM600 MPS rack (CPUM) security is being used. The
CPUM card’s panel also contains an LCD display for showing the level of a selected
monitored output in bar-graph and digital form. The Alert and Danger levels are also indicated
on the bar graph.
Coloured LEDs (named OK, A and D) on the panel of the CPUM indicate the OK, Alert and
Danger status for the signal selected for display (see Figure 2-11). If slot 0 is selected, these
LEDs will indicate the general rack status.
SLOT and OUT (output) keys on the panel are used to select which signal to display. The
ALARM RESET button on the panel resets all latched alarms (and associated relays) for the
entire rack.
Possibilities allowed by the CPUM / IOCN pair include:
• ‘One-shot’ configuration of all VM600 cards using a direct Ethernet or RS-232 serial
connection from an external computer (laptop, notebook, pen-computer, industrial
computer or flat-panel computer) running the VM600 MPSx software, from Meggitt
Sensing Systems’ Vibro-Meter product line.
• ‘One-shot’ configuration of all VM600 cards via Ethernet from a networked computer
running the VM600 MPSx software.
• Visualisation of signal levels and alarm limits using the display on the CPUM card’s
panel.
• External communication with third party devices such as a DCS or PLC.
• VM600 MPS rack (CPUM) security.
6.3 VM600 MPS rack (CPUM) security
A VM600 MPS in a 19 system rack (ABE04x) containing a CPUM card can implement
specific rack security features in order to limit the functionality of the MPS that are available
via the CPUM to Ethernet-based connections, such as the VM600 MPSx software, the
CPUM Configurator software or a Modbus TCP connection.
The use of the CPUM security features is recommended in order to help prevent accidental
or unauthorised access to a VM600 MPS configuration and other MPS system functionality,
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