User Manual

Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 75
Chapter 5
Diagnostics and Troubleshooting
This chapter describes troubleshooting the thermocouple/mV input module.
This chapter contains information on:
• safety considerations while troubleshooting.
• internal diagnostics during module operation.
• module errors.
• contacting Rockwell Automation for technical assistance.
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 status indicator on the module is illuminated, it indicates that
power is applied to the module and that it has passed its internal tests.
Stand Clear of Equipment
When troubleshooting any system anomaly, have all personnel remain clear of the
equipment. The anomaly could be intermittent, and sudden unexpected machine
motion could occur. Have someone ready to operate an emergency stop switch in
case it becomes necessary to shut off power.
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.