Calculating A Power Budget; Power Budget; B.1 Power Budget - Siemens SIMATIC S7 System Manual

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Calculating a power budget

Your CPU has an internal power supply that provides power for the CPU, the expansion

modules, signal boards, and other 24 V DC user power requirements. Use the following

information as a guide for determining how much power (or current) the CPU can provide for

your configuration. The new compact CPUs (CRs) do not support expansion modules or

signal boards.

Refer to the technical specifications for your particular CPU to determine the 24 V DC sensor

supply power budget, the 5 V DC logic budget supplied by your CPU and the 5 V DC power

requirements of the expansion modules and signal boards. Refer to the Calculating a power

budget to determine how much power (or current) the CPU can provide for your

configuration.

The standard CPU provides the 5 V DC logic power needed for any expansion in your

system. Pay careful attention to your system configuration to ensure that the CPU can

supply the 5 V DC power required by your selected expansion modules. If your configuration

requires more power than the CPU can supply, you must remove a module.

If the CPU power budget is exceeded, you may not be able to connect the maximum number

of modules allowed for your CPU.

The standard CPU also provides a 24 V DC sensor supply that can supply 24 V DC for input

points, for relay coil power on the expansion modules, or for other requirements. If your

power requirements exceed the budget of the sensor supply, then you must add an external

24 V DC power supply to your system. You must manually connect the 24 V DC supply to

the input points or relay coils.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

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