Appendix Application Illustration 92
2.2 Traditional solution
Whenever B1 or B 2 senses the approach of a visitor, the door is actuated to open. After an elapse of time, B1 or B2
senses no presence of a visitor; MC 4 will close the door.
2.3 Apply SG2 in Door Control System
Applying SG2 in door control system can simplify the circuit. All that one need to do is connect the action sensor,
limit switch and contactor with SG2.
Devices Applied
MC1 main door open contactor
MC2 main door close contactor
S1(NC contact) closing limit switch
S2(NC contact) opening limit switch
B1(NO contact) outdoor infrared sensor
B2(NO contact) indoor infrared sensor
Wiring Diagram and Program with SG2 applied in door control system.
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