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What This Appendix
Contains
Work with
1791DS-IB8XOB8 Modules
141
Get Point Status from Safety I/O Modules by
Using Explicit Messaging
This appendix provides information about how to use explicit
messaging to get point status information from safety I/O modules.
One of the variables in maximizing throughput when using DeviceNet
safety I/O modules is the size of the I/O assembly, with the other
variables being the requested packet interval and baud rate.
For maximum throughput you need to keep the I/O assembly at two
bytes or fewer. The two-byte I/O assemblies do not provide the
individual point status needed to quickly diagnose what point faulted
from an operator terminal. Read this appendix for a description of
how to get the point status via explicit messaging.
To work with 1791DS-IB8XOB8 modules, follow this procedure.
1. From the Module Definition dialog, use Combined Status-Muting
for Input Status.
Appendix
Publication 1791DS-UM001H-EN-P - April 2009
E
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