Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 62)

Publication 1794-6.5.11 - September 2011
36 Troubleshoot the Module
When an output indicator is yellow, the logic is driving an output alarm On.
After detecting a fault, the internal circuitry sets the output data to the
appropriate safe state, as defined by the module data table. Safe state control
may be adapter-dependent.
The input and output indicators are on the field side of the isolation path, and
display the logic state of the actual microcontroller input and output.
The status indicator initially powers up as solid green, indicating the power
supply is operating and internal diagnostic tests are being performed. After a
successful power up test, the indicator remains green. The indicator turns red
in about 1.5 s if there is an internal diagnostics error.
The module is operating correctly when the green OK indicator is on.
A red OK indicator shows that the module is in a Faulted condition, indicating
an internal error.
Diagnostics The frequency input module returns diagnostics to the PLC processor in Word
5 of the BTR file. These diagnostics give you information on the status or
condition of the module.
Indicator Condition Operating Description
Input (0, 1) Off (Dark) Input Turned Off, Input Not Used, or
Wire Disconnected
(Freq. or Gate) On (Yellow) Input Turned On
(Active High or Active Low if Inverted)
Fault (F) Off (Dark) Wire connected, normal operation or
detection disabled
(Freq. or Gate) On (Red
Flashing) Wire disconnected, fault condition
(for IEC1 + Proximity switch or switch contacts
with shunt resistor)
Output Alarm
(0, 1) Off (Dark) Output alarm turned off
On (Yellow) Output alarm turned on (Logic Drive On)
Status (OK) Off (Dark) 24V Power Turned Off,
or 5V Logic Power Problem
Solid Green Module OK, Normal Operating Mode
Solid Red Module Fault, Outputs Disabled