Time For Short Circuit Test; Startup Time Of Sensors After Short Circuit Test - Siemens SIMATIC ET 200SP Manual

4.2.2.2

Time for short circuit test

Function
When the short-circuit test is enabled, the corresponding sensor supply is switched off for
the configured time. If the module does not detect a "0" signal at the input within the
assigned time, a diagnostic message is generated.
When assigning parameters, note that
● If the channel is passivated, this may be due to too high capacitance between sensor
● The values available for the input delay depend on the "Ramp-up time of the sensor after
4.2.2.3

Startup time of sensors after short circuit test

Function
In addition to the off time ("Time for sensor test"), a startup time must be specified for
performing the short circuit test. You use this parameter to notify the module how long the
utilized sensor needs to start up after connecting the sensor supply. This prevents an
undefined input state due to transient reactions in the sensor.
When assigning parameters, note that
● This parameter must be greater than the transient recovery time of the employed sensor.
● Because the assigned time affects the response time of the module, we recommend that
● The values available for the input delay depend on the "Ramp-up time of the sensor after
Requirement
The short circuit test is enabled.
Digital input module F-DI 8x24VDC HF (6ES7136-6BA00-0CA0)
Manual, 07/2013, A5E03858068-01
supply and input. This consists of the capacitance per unit length of the cable and the
capacitance of the employed sensor. If the connected capacitance does not discharge
within the assigned time, you need to adjust the "Time for sensor test" parameter.
short-circuit test" and the "Time for short-circuit test" of the configured sensor supply.
you set the time as short as possible but long enough so that your sensor can settle
safely.
short-circuit test" and the "Time for short-circuit test" of the configured sensor supply.
Parameters/address space
4.2 Explanation of parameters
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