PLC concepts
5.1 Execution of the user program
S7-1200 Programmable controller
116 System Manual, V4.2, 09/2016, A5E02486680-AK
Configuring the outputs on a RUN-to-STOP transition
You can configure the behavior of the digital and analog outputs when the CPU is in STOP
mode. For any output of a CPU, SB or SM, you can set the outputs to either freeze the value
or use a substitute value:
● Substituting a specified output value (default): You enter a substitute value for each
output (channel) of that CPU, SB, or SM device.
The default substitute value for digital output channels is OFF, and the default substitute
value for analog output channels is 0.
● Freezing the outputs to remain in last state: The outputs retain their current value at the
time of the transition from RUN to STOP. After power up, the outputs are set to the
default substitute value.
You configure the behavior of the outputs in Device Configuration. Select the individual
devices and use the "Properties" tab to configure the outputs for each device.
Note
Some distibuted I/O modules offer additional settings for the reaction to CPU stop mode.
Select from the list of choices in
Device Configuration for those modules.
When the CPU changes from RUN to STOP, the CPU retains the process image and writes
the appropriate values for both the digital and analog outputs, based upon the configuration.
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