Rockwell Automation Allen-Bradley 1769-IF4, User Manual

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1 Publication 1769-UM002B-EN-P - July 2005
Chapter
5
Module Diagnostics and Troubleshooting
This chapter describes troubleshooting the analog input and output modules.
This chapter contains information on:
•
safety considerations when troubleshooting
•
module vs. channel operation
•
the module’s diagnostic features
•
critical vs. non-critical errors
•
module condition data
Safety Considerations
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.
Indicator Lights
When the green LED on the analog module is illuminated, it indicates that
power is applied to the module.
Activating Devices When Troubleshooting
When troubleshooting, never reach into the machine to actuate a device.
Unexpected machine motion could occur.
ATTENTION
Never reach into a machine to actuate a switch because
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.