Siemens S7-1200 System Manual page 987

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Table of Contents

Sample power budget

CPU power budget

CPU 1214C AC/DC/Relay

System requirements

CPU 1214C, 14 inputs

1 SB 1223 2 x 24 VDC Input/ 2 x

24 VDC Output

1 CM 1241 RS422/485, 5 V power

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 each

Total requirements

Current balance

Current balance total

Form for calculating your power budget

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 829) for the power

budgets of your CPU model and the power requirements of your signal modules.

Calculations for a power budget

CPU power budget

System requirements

Total requirements

Current balance

Current balance total

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

3 * 145 mA = 435 mA

1 * 105 mA = 105 mA

Calculating a power budget

14 * 4 mA = 56 mA

2 * 4 mA = 8 mA

3 * 8 * 4 mA = 96 mA

3 * 8 * 11 mA = 264 mA

8 * 4 mA = 32 mA