HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
9-48
Assigning alarm signals to relays on the RLC16 card
CONFIGURATION OF MPC4 / IOC4T CARDS
9.12.2 Using the Raw Bus to switch relays
The Raw Bus can be used to supplement the OC Bus by allowing additional alarm signals to
be routed to the relays on the RLC16 card. (The Raw Bus is common to all IOC4T and RLC16
cards.)
MPS configuration example
An example illustrating the use of the Raw Bus is shown in Figure 9-34. In this example, four
MPC cards and their corresponding IOC cards are mounted in a rack. It is assumed that the
Open Collector Bus is used to convey alarm signals to relay cards RLC #1 to RLC #4. The
OC Bus lines are not shown on this drawing for the sake of clarity, but they affect the following
links (see 3.4.3 Open Collector Bus):
• IOC #1 in slot 3 connects to RLC #1 in slot 1
• IOC #2 in slot 5 connects to RLC #2 in slot 2
• IOC #3 in slot 7 connects to RLC #3 in slot 15
• IOC #4 in slot 9 connects to RLC #4 in slot 16.
The Raw Bus in this example is used to allow each IOC card to access half an RLC16 card:
• IOC #1 and IOC #2 can access RLC #5 via Raw Bus lines 31 to 16
• IOC #3 and IOC #4 can access RLC #6 via Raw Bus lines 47 to 32.
3120756411 910 815 1314 1219 1718 1620
Raw Bus (23...16)
Raw Bus (15...8)
Raw Bus (7...0)
Raw Bus (47...40)
Raw Bus (39...32)
Raw Bus (31...24)
Raw Bus (63...56)
Raw Bus (55...48)
M
P
C
#
4
M
P
C
#
3
M
P
C
#
2
I
O
C
#
1
I
O
C
#
4
I
O
C
#
3
I
O
C
#
2
R
L
C
#
4
R
L
C
#
3
R
L
C
#
6
R
L
C
#
5
R
L
C
#
2
R
L
C
#
1
M
P
C
#
1
RPS 6U
#
2
RPS 6U
#
1
Figure 9-34: MPS configuration example showing use of the Raw Bus
(Front card
cage)
(Rear card
cage)
Rack
power
supply
Rack
power
supply
RLC16
locations
IOC4T, IOC8T, IRC4 or RLC16
locations
IRC4 or RLC16
locations
IOCN
location
Slot
IRC4 or RLC16
location
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