Calculating Your Power Requirement - Siemens SIMATIC S7 System Manual
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Also See for SIMATIC S7:
- System manual (866 pages) ,
- Functional safety manual (212 pages) ,
- User manual (134 pages)
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CPU power budget
CPU 1214C AC/DC/Relay
System requirements
CPU 1214C, 14 inputs
3 SM 1223, 5 V power
1 SM 1221, 5 V power
3 SM 1223, 8 inputs each
3 SM 1223, 8 relay coils each
1 SM 1221, 8 inputs
Total requirements
Current balance
Current balance total
B.3
Calculating your power requirement
Use the following table to determine how much power (or current) the S7-1200 CPU can
provide for your configuration. Refer to the technical specifications (Page 279) for the power
budgets of your CPU model and the power requirements of your signal modules.
CPU power budget
System requirements
Total requirements
Current balance
Current balance total
S7-1200 Programmable controller
System Manual, 11/2009, A5E02486680-02
B.3 Calculating your power requirement
5 VDC
1600 mA
Minus
5 VDC
-
3 * 145 mA = 435 mA
1 * 105 mA = 105 mA
-
-
-
540 mA
Equals
5 VDC
1060 mA
5 VDC
Minus
5 VDC
Equals
5 VDC
Calculating a power budget
24 VDC
400 mA
24 VDC
14 * 4 mA = 56 mA
-
-
3 * 8 * 4 mA = 96 mA
3 * 8 * 11 mA = 264 mA
8 * 4 mA = 32 mA
448 mA
24 VDC
(48 mA)
24 VDC
24 VDC
24 VDC
323
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- Introducing the S7-1200 Plc
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