Siemens SIMATIC S7-1200 - Page 1501

Technical specifications
A.13 Digital signal boards (SBs)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1501
Note
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 V DC, 200 kHz
(6ES7221-3BD30-0XB0)
SB 1221 DI 4 x 5 V DC, 200 kHz
(6ES7221-3AD30-0XB0)
① Supports sourcing inputs only
Table A- 188 Connector pin locations for SB 1221 DI 4 x 24 V DC, 200 kHz (6ES7221-3BD30-0XB0)
Pin
X19
1
L+ / 24 V DC
2
M / 24 V DC
3
DI e.0
4
DI e.1
5
DI e.2
6
DI e.3