Input Delay - Siemens Simatic S7-1500 Manual

Simatic s7-1500/et 200mp digital input module f-di 16x24vdc

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4.2.4.2

Input delay

Function

To suppress injected interference, you can set an input delay for a channel or a channel pair.

Interference pulses whose pulse time is less than the set input delay (in ms) are suppressed.

Suppressed interference pulses are not visible in the process image input (PII).

A high input delay suppresses longer interference pulses, but results in a longer response

time.

The set value for the input delay has to be smaller than the configured "Startup time of

sensors after short-circuit test" and smaller than the configured "Time for short-circuit test".

With 1oo2 evaluation, the input delay of the lower-order channel (channel n) automatically

applies to the higher-order channel (channel n+8).

Note

If there is an input delay < 3.2 ms, you have to use shielded cables.

Note

Due to the physical properties, there is a possibility of crosstalk between signals in the case

of long, unshielded signal lines (see section "Electromagnetic compatibility" in the system

manual S7-1500 Automation System

(http://support.automation.siemens.com/WW/view/en/59191792)).

If the interference pulses occur with a short-circuit test, the fail-safe digital inputs are

passivated. Increase the input delay or use shielded signal lines in order to prevent possible

passivation of the fail-safe digital inputs and switch-off of the internal sensor supply.

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