Rockwell Automation 1732DS-IB8 User Manual page 146

142 Get Point Status from Safety I/O Modules by Using Explicit Messaging
Publication 1791DS-UM001H-EN-P - April 2009
This creates a two-byte input assembly, as shown for a module
called IB8XOB8.
2. Use the combined InputStatus and combined OutputStatus bits
to detect if one or more of the I/O points on the module have a
fault.
• If either InputStatus or OutputStatus bit goes low
(l0 = bad; 1 = good), use an explicit message to determine
which individual data points have faulted.
• Use the InputStatus and OutputStatus bits to condition your
msg rungs as follows.
• Note that 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.