Siemens SIMATIC S7-1200 System Manual page 1443

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Table of Contents

Table A- 108 Wiring diagrams for the digital input SMs

SM 1221 DI 8 x 24 V DC (6ES7221-1BF32-

For sinking inputs, connect "-" to "M" (shown). For sourcing inputs, connect "+" to "M".

Table A- 109 Connector pin locations for SM 1221 DI 8 x 24 V DC (6ES7221-1BF32-0XB0)

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Functional Earth

No connection

A.9 Digital signal modules (SMs)

SM 1221 DI 16 x 24 V DC (6ES7221-1BH32-

No connection

Technical specifications