500 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Appendix A CIP Objects
Relay Control
Bit-wise setting controlling how the relay behaves under fault circumstances.
The status of bits 1 and 2 reflect conditions detectable by the auxiliary module
itself, and the remainder rely on the main module.
There are three parameters that use these bit definitions.
The objective being that more faults that the relay reacts to can be added
(above those faults implicit in the Voted Alarm selection) or dedicate the relay
only to the indication of certain selected faults.
Table 249 - Relay Control
Bit Description
0 Main Module Fault
1 Auxiliary Module Fault
2 Auxiliary Bus Communication Fail
3 E/IP Communication Failure
4 Tacho Fault
5 Reserved
6 Reserved
7 Latching
Parameter Description
Auto Relay Control This parameter follows the logic that when associated with a fail-safe voted alarm a
main/auxiliary module fault also activates the relay (so the appropriate bits are set).
Otherwise it is zero.
Read only to the user.
User Relay Control This parameter allows the user to select from a number of faults that can also be
considered.
Relay Control This parameter is a bit-wise logical AND of the Auto and User controls, and is what is
implemented and is read-only to the user.
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