Siemens SIMATIC PCS 7 Configuration Manual page 120

Configuration of the hardware (AS and I/O)
6.5 Configuration of the I/O devices
Analog output (6ES7332-5HD01-0AB0 in the example)
You need to configure how the outputs are to respond to a CPU STOP. In this example, the
outputs have no current or voltage (OCV setting).
Note
The channel-specific setting "Reaction to CPU STOP" (OCV - No Output Current or Voltage,
KLV - Keep Last Value and USV - Use Substitute Value) of a module (for example, analog
output module with four channels) within the ET 200M distributed I/O must be set identically
for all channels.
Process image partition (PIP)
Assign the process image partition to an I/O module you have previously defined in the CPU
properties for a cyclic interrupt OB (see the section titled "Assigning parameters for process
image partitions"). This step synchronizes the I/O values or signals of this module with the
process image in the CPU before and after the cyclic interrupt OB.
To do this, open the properties of the module and the "Addresses" tab and set the desired
process image partition (TPA1 in this case). The process image partition is therefore assigned
for all I/O values or signals of this module.
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Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA