Rockwell Automation 1771-IMD AC/DC(220V) INPUT Installation Instructions - Manual (Page 7)

7 AC/DC (220V) Input Module Cat. No. 1771-IMD Series B
Publication 1771Ć5.27
The front panel of your module contains one green, module active
LED, and 16 red status LED indicators. The 1771-IMD performs
diagnostics in a handshaking mode when first powered up. Upon
successful completion of the diagnostics, the green module active
indicator lights. It turns off if a fault occurs in the data paths or the
opto-isolators.
ACTIVE
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Module Active Indicator (green)
00 to 17 Status Indicators (red)
10552ĆI
If a module fault occurs, the module resets its inputs or sets them to
last state, depending on the fault mode selection. The module active
indicator must be on to properly interpret the red status indicators.
The red status indicators are provided for system logic side
indication of individual inputs. When a red indicator lights, voltage
is present on the terminal. The module transfers this information to
the backplane for the processor to read. See ”Troubleshooting” for a
description, probable cause, and recommended action to take for
common faults based on indicator responses.
Use this table to help you interpret the 1771-IMD status indicators
and to troubleshoot module and system faults.
Indicator Status (color) Description of Fault or System Status Action to Take
Module active ON (green) Normal Indication None
Module active ON (green) and
Input status ON (red)
Check for voltage on terminal If none, replace module
Module active ON (green) and
Input status OFF
Input devices not functioning properly or faulty
input circuitry on module
1. Check input devices
2. If input devices are OK, replace module
No voltage on terminal None
Module active OFF Module is not powered or fault in optoĆisolators
and/or data paths; module resets inputs or goes to
last state
1. Check chassis power supply and module
input power
2. If power supplies are OK, replace module
Module active OFF and
Input status ON (red) or OFF
Not valid unless module active indicator is on;
when active is off, indicators do not represent
processor status
1. Check chassis power supply and module
input power
2. If power supplies are OK, replace module
Interpreting the Status
Indicators
Troubleshooting