Configuring The Outputs On A Run-To-Stop Transition - Siemens SIMATIC S7-1200 System Manual

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5.1 Execution of the user program

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.

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.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK