Rockwell Automation 1771-OBD Series C INSTL INSTR DC(10-60V) OUTPUT - Manual (Page 11)

dc (10…60V) Output Module 11
Publication 1771-IN054C-EN-P - November 2006
Interpreting the LED Indicators
The front panel of your module contains one green module active indicator, 16 red status
indicators, and one red fuse blown indicator.
The green module active indicator lights when the module is powered and the processor
keyswitch is in RUN mode. The indicator light turns off when the processor resets the
outputs.
The module active indicator must be on to properly interpret
the red status indicators. The red status indicators are
provided for indication of individual outputs. They indicate
the state to which the transistor is commanded by the
processor and are powered by circuitry within the module.
The indicators will turn on and off as commanded by the
processor. They do not indicate the presence or absence of
dc power at an output terminal.
The module active indicator must be on to properly interpret
the red status indicators. The red status indicators are
provided for indication of individual outputs. They indicate
the state to which the transistor is commanded by the
processor and are powered by circuitry within the module. The indicators will turn on and off
as commanded by the processor. They do not indicate the presence or absence of dc power at
an output terminal.
The fuse blown indicator turns on when the fuse is blown. When the fuse blown indicator is
lit, check the fuse. After checking the fuse, make sure the field wiring arm is firmly in place.
Do this before checking the status of the other indicators.
Use this table to help you interpret the 1771-OBD status indicators and to troubleshoot
module and system faults.
Troubleshooting
Indicator Status Description Action
Module Active On (Green) Normal indication. None.
Module Active On (Green)
and Output Status On (Red) Check voltage at output point on
swing arm. If voltage is present, take no action. If no
voltage is present, replace module.
Module Active On (Green)
and Output Status Off Output point not on in data table. None.
Module failure. Replace module.
Module Active Off and
Output Status On or Off
(Red) Processor in Program mode. None.
Module not functioning properly. Check chassis power supply and processor.
If they are okay, replace module.
ACTIVE
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
FUSE
Module Active
Indicator (Green)
00…17 Status
Indicators (Red)
Fuse Blown
Indicators (Red)