You can remove any SM without removing the CPU or other SMs in place.
1. Ensure that the CPU and all S7-1200 equipment are disconnected from electri-
cal power.
2. Remove the I/O connectors and wiring from the SM (Page 65).
3. Retract the bus connector.
– Place a screwdriver beside the tab on the top of the SM.
– Press down to disengage the connector from the CPU.
– Slide the tab fully to the right.
If there is another SM to the right, repeat this procedure for that SM.