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148
Get Point Status from Safety I/O Modules by Using Explicit Messaging
Work with 1791DS-IB12
Modules
Publication 1791DS-UM001H-EN-P - April 2009
To work with 1791DS-IB12 modules, follow this procedure.
1. From the Module Definition dialog, use Combined Status-Muting
for the Input Status.
This creates a two-byte input assembly, as shown in the figure,
for a module called IB12.
2. Use the CombinedStatus bit to detect if one or more of the I/O
points on the module have a fault.
• If the CombinedStatus bit goes low (0 = bad; 1 = good) use an
explicit message to determine which individual data points
have faulted.
• Use the CombinedStatus bits to condition your msg rungs as
shown in the figure.
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