Siemens SIMATIC S7 System Manual page 721

Hide thumbs Also See for SIMATIC S7:

Table of Contents

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- 110 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

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

SB 1221 DI 4 x 5 VDC, 200 kHz

(6ES7 221-3AD30-0XB0)

553BTechnical specifications

A.8 Digital signal boards (SBs)

Show Quick Links

Table of Contents

Simatic s7-1200