Rockwell-automation 1769-IF16V Compact High Density Analog Input Modul Bedienungsanleitung PDF herunterladen (Seite 49)

Publication 1769-UM018A-EN-P - October 2008 49

Module Diagnostics and Troubleshooting Chapter 4

Channel Diagnostics

When an input channel is enabled, the modules perform a diagnostic

check to see that the channel has been properly configured. In

addition, the modules check each channel during every conversion

cycle for over-range and under-range, high and low process alarm

conditions, and open-circuit conditions.

Out-of-range Detection

Whenever data received at an input is out of the defined normal

operating range, an over-range or under-range error is indicated in the

Input Data file.

Process Alarm Detection

Whenever data received at an input meets or exceeds that channel’s

configured process alarm limits, a high alarm or low alarm error is

indicated at the Input Data file.

Open-circuit Detection

The 1769-IF16V module provides open-circuit detection on all

enabled channels. Whenever an open-circuit condition occurs, the

over-range error bit for that channel is set and the channel’s input data

reading will be at the maximum, full-range value in the Input Data

file.

The 1769-IF16C module also provides open-circuit detection on all

enabled channels. Whenever an open-circuit condition occurs, the

under-range error bit for that channel is set and the channel’s input

data reading will be at the minimum, full-range value in the Input

Data file.

Possible causes of an open circuit include:

• the sensing device may be broken.

• a wire may be loose or cut.

• the sensing device may not be installed on the configured

channel.

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Rockwell-automation 1769-IF16V Compact High Density Analog Input Modul Bedienungsanleitung Seite 49