Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
3-11
VM600 6U 19" rack backplane (ABE04x)
GENERAL SYSTEM DESCRIPTION
3.4.3 Open Collector Bus
Each Open Collector Bus (OC Bus) contains 16 parallel bus lines and is a dedicated bus
linking one specific IRC4 or RLC16 card to two specific IOC4T or IOC8T cards
(see Figure 3-6).
The OC buses are reserved for sending alarm signals from an MPC4 / IOC4T card pair or an
AMC8 / IOC8T card pair to an IRC4 or RLC16 card. These signals are then used to switch
relays on the IRC4 or RLC16.
The ABE04x rack contains the following dedicated OC Buses:
Table 3-1: Slots linked by the various OC Buses
OC Bus name
RLC16
slot location
IRC4
slot location
IOC4T or IOC8T
slot location
OC Bus A Slot 1 Slot 1 Slots 3 and 4
OC Bus B Slot 2 Slot 2 Slots 5 and 6
OC Bus C Slot 15 Slot 15 Slots 7 and 8
OC Bus D Slot 16 N/A Slots 9 and 10
OC Bus E Slot 17 N/A Slots 11 and 12
OC Bus F Slot 18 N/A Slots 13 and 14
Figure 3-6: Rear view of rack showing the six dedicated OC Buses
and the Raw Bus (top)
RLC16
locations
IOC4T, IOC8T, IRC4 or RLC16
locations
IRC4 or RLC16
locations
IOCN
location
OC Bus F
OC Bus E
OC Bus D
OC Bus C
OC Bus B
OC Bus A
1718 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IRC4 or RLC16
location
Raw Bus
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