Siemens S7-1200 System Manual page 936

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Table of Contents

Technical specifications

A.11 Digital signal boards (SBs)

When switching frequencies above 20 kHz, it is important that the digital inputs receive a

square wave. Consider the following options to improve the signal quality to the inputs:

• Minimize the cable length

• Change a driver from a sink only driver to a sinking and sourcing driver

• Change to a higher quality cable

• Reduce the circuit/components from 24 V to 5 V

• Add an external load at the input

Table A- 187 Wiring diagrams for the 200 kHz digital input SBs

SB 1221 DI 4 x 24 VDC, 200 kHz

(6ES7 221-3BD30-0XB0)

Supports sourcing inputs only

Table A- 188 Connector pin locations for SB 1221 DI 4 x 24 VDC, 200 kHz (6ES7 221-3BD30-0XB0)

SB 1221 DI 4 x 5 VDC, 200 kHz

(6ES7 221-3AD30-0XB0)

System Manual, 03/2014, A5E02486680-AG

S7-1200 Programmable controller