Siemens PLC realizes the design and learning reference of the star-delta step-down startup - Database & Sql Blog Articles

Photocoupler

Relay circuit diagram and control diagram of star triangle step-down startup:

Plc circuit diagram design according to process requirements. The PLC circuit diagram design is as follows:

According to the star triangle start circuit drawing process flow chart is as follows

The PLC device address assignment is as follows:

Zone I (input zone)

I0.0 start button SB2

I0.1 stop button SB1

I0.2 Power Circuit Breaker QF

Q area

Q0.0 main circuit contactor KM1

Q0.1 Star Start Contactor KM2

Q0.2 Triangle Contactor KM3

Zone T

T37 10 second timer

Program according to the circuit diagram, flow chart and assigned device address. The program reference picture is as follows: