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Safety Considerations
1
Diagnostics and Troubleshooting
This chapter describes module troubleshooting, containing information
on:
• safety considerations when troubleshooting
• module vs. channel operation
• the module's diagnostic features
• critical vs. non-critical errors
• module condition data
• contacting Rockwell Automation for assistance
Safety considerations are an important element of proper troubleshooting
procedures. Actively thinking about the safety of yourself and others, as
well as the condition of your equipment, is of primary importance.
The following sections describe several safety concerns you should be
aware of when troubleshooting your control system.
Never reach into a machine to actuate a switch because
ATTENTION
unexpected motion can occur and cause injury.
!
Remove all electrical power at the main power disconnect
switches before checking electrical connections or inputs/
outputs causing machine motion.
Indicator Lights
When the green LED on the thermocouple module is illuminated, it
indicates that power is applied to the module and that it has passed its
internal tests.
Activating Devices When Troubleshooting
When troubleshooting, never reach into the machine to actuate a device.
Unexpected machine motion could occur.
AB PLCs
5
Chapter
Publication 1769-UM005A-EN-P
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