Activated Light Test - Siemens SIMATIC ET 200SP Manual

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.
Test pulses of the light test
*
Figure 4-4
A light pulse with the configured duration takes place within the configured maximum test
period per output channel.
If a light pulse returns a fault, the same light pulse (which means the same bit pattern) is
repeated once after 500 ms. If the fault is still present, the maximum test period is
automatically reduced to 60 seconds and a diagnostics alarm is generated. If the fault is no
longer present, the output channel is reintegrated after the next fault-free test cycle.
4.2.2.6

Activated light test

The light test is always enabled for this F-module.
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA
Output of test pulses only during test cycle.
Test pulses of the light test
Parameters/address space
4.2 Explanation of parameters
23