Allen-Bradley 1756-L6 Series, Reference Manual, Page: 87 / 134

Rockwell Automation Publication 1756-RM001I-EN-P - May 2012 87
Chapter
8
Faults in the ControlLogix System
In addition to providing information on module fault reporting, this chapter
explains two example conditions that will generate a fault in a SIL 2-certified
ControlLogix system:
• Keyswitch changing out of Run mode
•
High alarm condition on an analog input module
Detecting and Reacting to
Faults The ControlLogix architecture provides many ways of detecting and reacting to
faults in the system.
•
Various device objects can be interrogated to determine the current
operating status.
• Modules provide run-time status of their operation and of the process that
is executing.
• You can configure a ControlLogix system to identify and handle faults,
including such tasks as:
– developing a fault routine.
– creating a user-defined major fault.
– monitoring minor faults.
– developing a power-up routine.
See the Logix5000 Controllers Common Procedures Programming
Manual, publication
1756-PM001 , for more information.
It is your responsibility to determine what data is most appropriate for your
application to initiate a shutdown sequence.
Topic Page
Detecting and Reacting to Faults 87
Module Fault Reporting for Any ControlLogix or FLEX I/O Module 88
Checking Keyswitch Position with GSV Instruction 88
Examining an 1756 Analog Input Module’s High Alarm 89
Additional Resources 90
TIP
To help handle faults, make sure you have completed the input (see Checklist
for SIL Inputs on page 122 ) and output (see Checklist for SIL Outputs on
page 124 ) checklists for their application.
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