Siemens SIMATIC NET S7-1200 Operating Instructions Manual page 29

Procedure for installation and commissioning
Note
Installation location
During installation, make sure that the upper and lower ventilation slits of the module are not
obstructed and good ventilation is possible. Above and below the device, there must be a
clearance of 25 mm to allow air to circulate and prevent overheating.
Remember that the permitted temperature ranges depend on the position of the installed
device.
Device position / permitted temperature range
Horizontal installation of the rack:
0 °C to 55 °C
Vertical installation of the rack:
0 °C to 45 °C
Note
Connection with power off
Only wire up the S7-1200 with the power turned off.
Power supply from the power outputs of the CPU
The power of the CM must be supplied via the power outputs of the CPU.
Keep within the maximum load of the power outputs of the CPU.
You will find data relating to the current consumption and power loss of the CM in the
section Technical specifications of the CM 1243-5 (Page 41).
Grounding the PROFIBUS cable
If a CM 1243-5 is plugged into the S7-1200, a PROFIBUS cable must always be connected to
the CM 1243-5. The PROFIBUS cable must be grounded.
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06
Installation, connecting up, commissioning
3.3 Installing, connecting and commissioning
Installation location
29