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Work with
1791DS-IB4XOW4 Modules
Get Point Status from Safety I/O Modules by Using Explicit Messaging
To work with 1791DS-IB4XOW4 modules, follow this procedure.
1. From the Module Definition dialog, use Combined Status-Muting
for the Input Status.
This creates a one-byte assembly, as shown in the figure, for a
module called IB4XOW4.
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 (0 = 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 shown in the figure.
Publication 1791DS-UM001H-EN-P - April 2009
145
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