Max. Readback Time Light Test - Siemens SIMATIC ET 200SP Equipment Manual

4.2.2.5

Max. readback time light test

Function
Short-circuit is detected with a 0-signal at the output.
For a light test, a test signal is switched to the output channel while the output channel has
the 0-signal. The output channel is switched on briefly during the light test (= "light period")
and read back. A sufficiently slow actuator does not respond to this and remains switched off.
①
Figure 4-3
If the signal was not read back correctly once the maximum readback time light test has
expired, the output channel is passivated.
No new process values are switched to the output channels while a bit pattern is still active
(switch test is carried out). This means that a higher maximum readback time light test for
the light test increases the reaction time of the F-module.
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Equipment Manual, 12/2022, A5E38578424-AB
Readback
Functional principle of the light test
Parameters/address space
4.2 Explanation of parameters
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