Siemens SIMATIC S7 Functional Safety Manual page 84

Fail-Safe CPU and signal module (SM) installation
4.1 S7-1200 Fail-Safe modules installation and removal
Always ensure that whenever you replace or install an S7-1200 device you use the correct
module or equivalent device.
Incorrect installation of an S7-1200 module may cause the program in the S7-1200 to
function unpredictably.
Failure to replace an S7-1200 device with the same model, orientation, or order could result
in death, severe personal injury and property damage due to unexpected equipment
operation.
Replace an S7-1200 device with the same model, and be sure to orient and position the
module correctly.
Do not disconnect equipment when a flammable or combustible atmosphere is present.
Disconnection of equipment when a flammable or combustible atmosphere is present may
cause a fire or explosion which could result in death, serious injury and property damage.
Always follow appropriate safety precautions when a flammable or combustible atmosphere
is present.
Note
Electrostatic discharge can damage the device or the receptacle on the CPU.
Make contact with a grounded conductive pad or wear a grounded wrist strap whenever you
handle the device.
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WARNING
WARNING
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA