Siemens SIMATIC S7-1200 System Manual page 1503

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Table of Contents

Technical data

Switching delay

Behavior on RUN to STOP

Number of outputs on simultaneously

Cable length (meters)

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

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

S7-1200 Programmable controller

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

SB 1222 DQ 4 x 24 V DC, 200 kHz

1.5 μs + 300 ns rise

1.5 μs + 300 ns fall

Last value or substitute value (default value 0)

2 (no adjacent points) at 60 °C

horizontal or 50 °C vertical

4 at 55 °C horizontal or 45 °C verti-

50 shielded twisted pair

Technical specifications

A.13 Digital signal boards (SBs)

SB 1222 DQ 4 x 5 V DC, 200 kHz

200 ns + 300 ns rise

200 ns + 300 ns fall