Summary – Rockwell Automation 1791-IOBB USER MANUAL User Manual
Page 31
Troubleshooting
Chapter 6
6Ć2
Table 6.A
Troubleshooting Chart
Indication
Probable Cause
Corrective Action
Green COMM LED on
Red POWER LED on
I/O status LED on/off
Normal indication
None required
Red POWER LED flashing
Block failed self-test, or a major fault is detected.
Cycle power to the block. If problem persists,
replace the block.
Red POWER LED off
No 24V dc power connected, or hardware fault.
Check 24V dc power to block
Green COMM LED off
No communication with processor, scanner etc.
Check that power LED is on. Make sure that
proper number of blocks are configured.
Green COMM LED flashing
Reset command (or output disable bit for SLC) has
been issued by processor or scanner.
Check program. Correct as necessary.
SLC or programmable controller not in run mode.
Place in run mode.
In this chapter you learned about the LED indicators and how to use them
to troubleshoot the block I/O module.
Summary