Siemens SIMATIC S7-1500R/H Getting Started page 16

Connecting traffic light control
The following figure shows the wiring of the traffic lights on the DQ 4x24VDC/2A ST digital
output module
Figure 1-4
Connecting barrier control
The following figure shows the wiring of the barrier control on the DQ 4x24VDC/2A ST digital
output module
The barrier is opened and closed via a three-phase motor. The direction of rotation of the
three-phase motor is controlled via a reversing contactor:
● Open barrier → Contactor K1 actuated
● Close barrier → Contactor K2 actuated
If the barriers have reached their respective end position, they automatically switch off via
limit switches.
Figure 1-5
S7-1500R/H redundant system
Getting Started, 10/2018, A5E44910930-AA
②
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Wiring of the traffic lights
③
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Wiring of the barrier control
Introduction to the example
1.5 Wiring diagram for a tunnel section
15