Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 133)

Chapter
4
4Ć1
Troubleshooting
This chapter contains two troubleshooting guides. One describes how to
interpret the LED indicators on the front of the PID module (Table 4.A).
The second troubleshooting guide provides assistance when a
programming error is encountered (Table 4.B).
The operational status of the module is continuously indicated by the front
panel LED indicators. Their status can be off, on, flashing or toggling.
Flashing is defined as a condition affecting only one of the indicators
when the other two are not changing. Toggling is defined as a condition
where two indicators are alternately turning on and off.
Probable causes of programming errors, indication of these errors, and
recommended corrective action are listed in Table 4.B.
Be sure to read Programming Recommendations for Start-Up (chapter 3).
General
LED Troubleshooting Guide
Program Troubleshooting Guide