Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 86)

Troubleshooting
Chapter 7
7Ć2
Figure 7.1
Module Indicators for Chassis A or B
12292
ACTIVE
(green)
CBM
FAULT
(red)
I/O RACK
FAULT
(red)
Output status
indicators are red.
On = output
Blown fuse
indicators are clear.
On = blown fuse
Input Module Indicators
Input status indicators are clear. On = input
One indicator per terminal.
1771-PM Module 1771-IA Modules 1771-OD Module
Refer to tables 7.A and 7.B
Output Module Indicators PM Module Indicators
Table 7.A
ACTIVE Indicator
If the ACTIVE indicator is blinking, identify the problem by the number of blinks. There are 2 sets of blinks:
first set of blinks short pause second set of blinks long pause
repeat continuously
Number of Blinks
1st Set 2nd Set Problem Correction
1 3 Faulty RAM Replace 1771ĆPM module
1 4 Faulty PROM Replace 1771ĆPM module
2 1 Illegal rack address Set the 1771ĆPM module switches as detailed in chapter 3
2 3 The 1771ĆPM modules contain different firmware Install 1771ĆPM modules with identical revision codes
3 2 Missing a 1771ĆPM module at power up Install and fully seat both 1771ĆPM modules
3 4 Illegal interrupt Cycle power Replace 1771ĆPM module
4 1 Firmware fault Replace 1771ĆPM module
4 3 Lost communications between 1771ĆPM modules,
or watchdog timed out
Check connections between 1771ĆPM modules or
Replace 1771ĆPM module