Introduction to dealing with channel and module faults

At a Glance

Counting modules can indicate and identify faults occurring in their configuration and during operation. These indication/identification functions vary according to the type of module.

In addition, module outputs have fallback modes, which are either preset or can be configured, in order to ensure safe operation. Output behavior is described in detail in the Description of physical outputs associated with counting modules section.

Dealing with TSX CTY 2A / 4A module faults

These modules indicate that a fault has occurred, shown by the following default exchange language objects:

channel error CH_ERROR (%Ir.m.c.ERR)
module error MOD_ERROR (%Ir.m.MOD.ERR)
invalid measurement INVALID_MEAS (%IWr.m.c.2.7)

The project can identify the cause of the fault by examining the status words. This is only possible if the fault is still present when the processing takes place.

Dealing with TSX CTY 2C module faults

This module uses the same language objects as before to indicate the occurrence of faults.

However, in addition, it has functions for:

storage, which is used to acknowledge and identify temporary faults,
and masking, which is used selectively to avoid certain faults being brought up again.