Siemens S7-200 PLC programming examples – Belt conveyor control

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(1) control requirements
Motors M1, M2, M3 three drive belt conveyor.Press the start button SB1, start the order of M1, M2, M3, the interval of 3s.Press the stop button SB2, the order of the parking for M3, M2, M1, the interval of time is 3s. Three motors M1, M2, M3 respectively through the contactor KM1, KM2, KM3 connected three-phase AC power supply, with PLC control of the coil of the contactor.
(2)Address allocation table for programming elements
 Programming element
I/O terminals
(program address)
Circuit devices
(PT timer value)
function
 input relay
    I0.0
    SB1
start button
    I0.1
    SB2
Stop button
 output relay
    Q0.0
    KM1
M1 Contactor
    Q0.1
    KM2
M2 Contactor
    Q0.2
    KM3
M3 Contactor
Timer(100ms)
    T37
    50
Start first period of time
    T38
    50
Start second period of time
    T39
    30
Parking first period of time
    T40
    30
Parking second period of time
Auxiliary relay
    M0.0
Parking holding first
period of time
    M0.1
Parking holding second period
(3)Ladder Diagram

PLC ladder programming


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