Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 89)

Publication 1753-UM001C-EN-P - March 2010 89
Wire and Configure the 1753-IB16XOB8 Module Chapter 8
3-pole Connection With Line Monitoring
Two 2-pole channels can support dual-channel devices with only a
single reference connection. If line monitoring is required, the
channels must be configured in pairs, using the system parameter
DO[xx][xx].in pairs. There are four pairs allowed: channels 1 and 2,
channels 3 and 4, channels 5 and 6, and channels 7 and 8.
Line monitoring is accomplished by switching off one channel while
the second channel is tested for wiring faults.
A detected line fault is reported by the module’s error codes. See
Appendix B for error code information.
IMPORTANT
Inductive loads must be connected with a protection diode on
the load for 3-pole connections.
1753-IB16XOB8 Load
(drive, valve)
3-pole Configuration