Allen-Bradley 1732ES-IB12XOB4, User Manual, Page: 127 / 176

Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016 127
Get Diagnostic Status from Modules by Using Explicit Messaging Appendix A
1732ES-IBXOB8 Modules
1. In the Module Definition dialog box, from the Input Status pull-down
menu, choose Combined Status.
This selection creates a three-byte input assembly, as shown here.
2. Use the CombinedInputStatus and CombinedOutputStatus bits to
detect if one or more of the I/O points on the module have a fault.
• If any input or output status bits go to a value of 0 (0 = bad; 1 =
good), use the CombinedInputStatus and CombinedOutputStatus
bits to condition your MSG rungs as follows.
Only use of the CombinedInputStatus bit is shown. Create similar
rungs by using the CombinedOutputStatus bit instead of the
CombinedInputStatus bit.
• The second rung can be used to read the status on mode transition
and once a fault is detected, continue reading until the fault is
corrected.