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4.3 Relay Logic (Group Lines)
Although rare, complicated relay logic may exceed the allowable limit for “cross monitor voting”. Cross
monitor voting occurs when the logic for the relay channel (i.e. in slot 6) includes signals (i.e. from
Slots 4 and 5), as shown in the example below.
The VC-8000 architecture provides 16 “group lines” for cross monitor voting. If you exceed this limit,
you will get an error message when you attempt to send the configuration to the rack. The Setup
software does not warn you of this error during off-line configuration.
If you have concerns, one way to minimize cross monitor voting logic (for example) is to place ‘Brg 1’
relay channel in the same monitor as the ‘Brg 1’ signal channels as shown below.
Figure 4-2) Relay Groups
Using Asset Groups helps as well. In scenario 1 (Figure 4-3), two group lines are used to bring each
channel (independently) from slot 4 to the relay in slot 6. In scenario 2 only one group line will be
used to bring the status of the group “Brg 01” to the relay in slot 6. Note: The connector lines used to
build relay logic do not represent group lines.
Figure 4-3) Asset Groups
Scenario 1
Three group lines are used
Scenario 2
Scenario 3
Two group lines are used
Scenario 4
One group line is used
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