Explanation Of Parameters; F-Parameters; Parameters Of The Sensor Supply; Short Circuit Test - Siemens SIMATIC ET 200SP Manual

Parameters/address space

4.2 Explanation of parameters

4.2 Explanation of parameters
4.2.1

F-parameters

F-parameters
Information on F-parameters is available in the SIMATIC Safety - Configuring and
Programming (http://support.automation.siemens.com/WW/view/en/54110126) manual.
4.2.2

Parameters of the sensor supply

4.2.2.1

Short circuit test

Here you enable the short-circuit detection for the channels of the F-module for which
"Internal sensor supply" is set.
The short-circuit test is only useful if you are using simple switches that do not have their
own power supply. For switches with power supply, for example, 3/4-wire proximity switches,
a short-circuit test is not possible.
The short-circuit detection switches off the sensor supply briefly. The length of the
deactivation period is equivalent to the configured "Time for sensor test".
If a short-circuit is detected, the F-module triggers a diagnostic interrupt and the input is
passivated.
The following short-circuits are detected:
● Short-circuit of input to L+
● Short-circuit of the input of another channel when it has a 1 signal
● Short-circuit between the input and sensor supply of another channel
● Short-circuit between the sensor supply and the sensor supply of another channel
If the short-circuit test is disabled, you must make your wiring short-circuit and cross-circuit
proof or select a connection type (discrepancy, non-equivalent) which also detect the cross-
circuits using discrepancy.
During the execution time (Time for sensor test + Startup time of sensor after sensor test) of
the short circuit test, the last valid value of the input before the start of the short circuit test is
passed to the F-CPU. The activation of the short-circuit test thus affects the response time of
the respective channel or channel pair.
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Digital input module F-DI 8x24VDC HF (6ES7136-6BA00-0CA0)
Manual, 07/2013, A5E03858068-01