Publication 1794-6.5.11 - November 1997
6-2
Troubleshoot the Frequency Input Module
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 1.5s 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
(internal error).
Indicator
Condition
Operating Description
Input (0, 1)
(Freq, or Gate)
Off (Dark)
Input Turned Off, Input Not Used, or Wire Disconnected
On (Yellow)
Input Turned On (Active High or Active Low if Inverted)
Fault (F)
(Freq, or Gate)
Off (Dark)
Wire Connected, Normal Operation or Detection Disabled
On (Red Flashing)
Wire Disconnected, Fault Condition (Or low shunt current)
Output
(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 MicroController / Watchdog Fault, Outputs Disabled