12 Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
Chapter 1 Safety Function Operation
The module is designed for use in applications where the safety state is the off
state.
Self-diagnostic Functions
Self-diagnostics are performed when the power is turned on and periodically
during operation. If a fatal internal module error occurs, the red module status
(MS) indicator illuminates, and the safety outputs and input data and status to
the network turn off.
Configuration Lock
After configuration data has been downloaded and verified, the configuration
data within the module can be protected.
For GuardLogix® systems, the status indicator is not used. For information
about safety signatures, see the appropriate GuardLogix Safety Reference
Manual, which is listed in the Additional Resources on page 10
.
I/O Status Data
The module provides status data for monitoring the
I/O circuits and I/O data. The status data includes the following data, which
the controllers can read. 1 = ON/Normal, and 0 = OFF/Fault/Alarm.
• Individual point input status
•Combined input status
• Individual point output status
• Combined output status
• Individual test output status
• Individual output readback (actual ON/OFF state of the outputs)
Status data indicate whether each safety input, safety output, or test output is
normal (normal status: ON, faulted status: OFF). For fatal errors,
communication connections can be broken, so the status data cannot be read.
Combined status is provided by an AND of the status of all safety inputs or all
safety outputs. When all inputs or outputs are normal, the respective combined
status is ON. When one or more of them has an error, the respective combined
status is OFF. This status is known as the combined safety input status or
combined safety output status.
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