553BTechnical specifications
A.8 Digital signal boards (SBs)
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
723
NOTICE
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- 113 Wiring diagrams for the 200 kHz digital output SBs
SB 1222 DQ 4 x 24 VDC, 200 kHz
(6ES7 222-1BD30-0XB0)
SB 1222 DQ 4 x 5 VDC, 200 kHz
(6ES7 222-1AD30-0XB0)
①
For sourcing outputs, connect "Load" to "-" (shown). For sinking outputs, connect "Load" to "+". Because both sinking
and sourcing configurations are supported by the same circuitry, the active state of a sourcing load is opposite that of a
sinking load. A source output exhibits positive logic (Q bit and LED are ON when the load has current flow), while a sink
output exhibits negative logic (Q bit and LED are OFF when the load has current flow). If the module is plugged in with
no user program, the default for this module is 0 V, which means that a sinking load will be turned ON.