Siemens SIMATIC ET 200SP HA Handbuch Ausrüstung - Seite 35

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Principle of change-over contact diagnostics

If the digital inputs of a channel group are configured as "change-over contacts", the module for

this channel group carries out diagnostics for the change-over contact encoder type.

If the plausibility check is negative, the following happens:

• The module identifies the value status of the NO channel as "invalid" (QI = "0").

• The module creates a diagnostics entry for the NO channel.

• If the change-over contact error diagnostics is enabled, a diagnostic interrupt is triggered.

The digital input signal and the value status are only updated for the NO channel. The digital

input signal is 0 and the value status is "invalid" (QI = "0") for the NC channel. This channel is only

used for a validity check of the sensor.

Special features

Please note the following special features for change-over contact diagnostics:

• If the normally open and normally closed contact signals are not plausible after 300 ms, a

change-over error is output as diagnostics information.

• If there is already a fault (QI = 0, e.g. a wire break), the module will no longer perform

diagnostics for change-over errors.

• There are different diagnostics options depending on the type of change-over contact.

Depending on the encoder type, a change-over error can have different causes.

– In the case of connected change-over contacts, a change-over error may also be the result

– In the case of unconnected change-over contacts, a change-over error may also be the

– If a wire break or short-circuit can be detected with the particular encoder type but its

DI 16xNAMUR HA

Equipment Manual, 08/2019, A5E39293880-AD

7.4 Useful information about diagnostics for the change-over contact encoder type

of a short-circuit (encoder is not defective; there is a short-circuit).

result of a wire break.

diagnostics is not enabled, instead of the wire break or short-circuit diagnostics

information, the change-over error diagnostics information is displayed if this is enabled.

Displays and interrupts