96BInstallation
3.2 Power budget
S7-1200 Programmable controller
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System Manual, 11/2011, A5E02486680-05
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Side view
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Vertical installation
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Horizontal installation
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Clearance area
3.2
Power budget
Your CPU has an internal power supply that provides power for the CPU, the signal
modules, signal board and communication modules and for other 24 VDC user power
requirements.
Refer to the technical specifications (Page 657) for information about the 5 VDC logic budget
supplied by your CPU and the 5 VDC power requirements of the signal modules, signal
boards, and communication modules. Refer to the "Calculating a power budget" (Page 761)
to determine how much power (or current) the CPU can provide for your configuration.
The CPU provides a 24 VDC sensor supply that can supply 24 VDC for input points, for relay
coil power on the signal modules, or for other requirements. If your 24 VDC power
requirements exceed the budget of the sensor supply, then you must add an external
24 VDC power supply to your system. Refer to the technical specifications (Page 657) for the
24 VDC sensor supply power budget for your particular CPU.
Note
The CM 1243-5 (PROFIBUS master module) requires power from the 24 VDC sensor supply
of the CPU.