Rockwell Automation 1790D-NOV2/TNOV2 CompactBlock LDX Analog Modules - Manual (Page 55)

1 Publication 1790-UM001A-EN-P - March 2002
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
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 MOD and NET LED indicator lights on the analog
module are illuminated, it indicates that power is applied to the
module, and the module is communicating on the network.
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.