HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
3-12
VM600 6U 19" rack backplane (ABE04x)
GENERAL SYSTEM DESCRIPTION
The IOC card drives the OC Bus lines using open collector driver circuitry (see Figure 3-7).
In the event of an alarm, the bus driver control signal goes high.
The attribution of a specific alarm signal (generated by an MPC4 / IOC4T card pair or an
AMC8 / IOC8T card pair) to an OC Bus line is done under software control.
NOTE: Refer to the relevant manual for further information: VM600 MPS1 software
manual or VM600 MPS2 software manual.
The attribution of a specific line on the OC Bus to a specific relay on the RLC16 is done by
setting jumpers on the RLC16. This is described in 9.12.1 Using the Open Collector Bus (OC
Bus) to switch relays and 10.8.1 Using the Open Collector Bus (OC Bus) to switch relays.
The IRC4 doesn’t have any jumpers but in order to use the OC Bus signals, the location of
the card must be as defined in Table 3-1.
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