Siemens SIMATIC ET 200SP System Manual page 146

Configuration control (option handling)
9.1 Configuring
Required steps
Enable the "Allow to reconfigure the device via the user program" parameter when
configuring the CPU/interface module in STEP 7 (TIA Portal).
● The "Allow to reconfigure the device via the user program" parameter is located in the
"Configuration control" area for an ET 200SP CPU.
● The "Allow to reconfigure the device via the user program" parameter is located in the
"Module parameter" area under "General" for an IM 155-5 PN interface module.
Figure 9-2 Enabling configuration control using an IM 155-6 PN HF as an example
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Distributed I/O system
System Manual, 12/2015, A5E03576849-AF