Electronic Short-Circuit Fault Recovery - Honeywell Series 8 I/O User Manual


The channel in Manual mode

The former Primary's output miscompare Soft Failure will Return To Normal
once both modules synchronize.

Electronic Short-Circuit Fault Recovery

To return the channel to normal operation the shorted device or shorted wiring must be
corrected.
To clear the short-circuit fault, perform the following steps.
CAUTION
Immediately after the IOM detects the fault and the Digital Output channel is
set to OFF, it should be safe to perform maintenance action.
Once the Digital Output channel is set ON, no maintenance action can
occur.
Step
1
Find and clear the wiring fault. This must be done prior to attempting to
restore the Digital Output channel to on-control.
Note: The fault may exist at various locations including the IOM, IOTA,
external field devices and wiring connecting these devices. After attempting
to clear the fault at any of these locations, perform step 2.
2
Once the actual fault has been cleared, your appropriate plant personnel can
restore the Digital Output channel to normal operation by setting the Digital
Output while still in Manual or setting the mode to Cascade and resuming
Digital Output writes (programmatically based on user strategy).
R500
April 2017
6.12. Electronic Short-Circuit Protection (Digital Output 24VDConly)
Action
Series 8 I/O User's Guide
Honeywell
6. Series 8 I/O Configuration
203