Siemens SIMATIC S7 Functional Safety Manual page 86

Fail-Safe CPU and signal module (SM) installation
4.1 S7-1200 Fail-Safe modules installation and removal
Table 4- 1 Installing the CPU on a DIN rail
Task
Table 4- 2 Removing the CPU from a DIN rail
Task
86
Procedure
1. Install the DIN rail. Secure the rail to the mounting panel every 75 mm.
2. Ensure that the CPU and all S7-1200 equipment are disconnected from electrical
power.
3. Hook the CPU over the top of the DIN rail.
4. Pull out the DIN rail clip on the bottom of the CPU to allow the CPU to fit over the
rail.
5. Rotate the CPU down into position on the rail.
6. Push in the clips to latch the CPU to the rail.
Procedure
1. Ensure that the CPU and all S7-1200 equipment are
disconnected from electrical power.
2. Disconnect the I/O connectors, wiring, and cables from
the CPU. Refer to the terminal block removal instruc-
tions (Page 89).
3. Remove the CPU and any attached communication
modules as a unit. All signal modules should remain in-
stalled.
4. If an SM is connected to the CPU, then retract the bus
connector:
– Place a screwdriver beside the tab on the top of the
signal module.
– Press down to disengage the connector from the
CPU.
– Slide the tab fully to the right.
5. Remove the CPU:
– Pull out the DIN rail clip to release the CPU from the
rail.
– Rotate the CPU up and off the rail, and remove the
CPU from the system.
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA