Three conveyor belts, respectively, by the motor M1, M2, M3 driven.
Requirements: After pressing the start button SB1, a startup sequence for M1, M2, M3, interval of 3s.
After the stop button SB2, Sequential stopping for M3, M2, M1, interval of 3s.
Three motors M1, M2, M3, respectively, through the contactor KM1, KM2, KM3 three-phase AC power supply is turned on, PLC control coil contactor
When I0.0 changes from 0 to 1, T102 normally closed contact closure, T101 is started and start time: When the T101 SV reaches the set PT (50 × 100ms = 5s)
, T101 is turned on, T101 normally open contact closure, T102 is started, the start time; When the T102 current value of SV reaches its set value PT (5s), T102 is turned on, normally closed contacts disconnect T102, T101 reset, T101 makes the current value SV = 0, T101 normally open contacts disconnect, T102 reset, T102 NC contact is closed, T101 restarted, begin the next cycle.
An electrical start of the conveyor belt, At the beginning of the conveyor belt has two push button switches: S1 for START and a STOP of the S2.
At the end of the conveyor belt also has two buttons switches: the S3 for START and STOP for the S4. You can start or stop the belt from either end. In addition, when an object on the conveyor belt reaches the end, the Sensor S5 Make Conveyor belts Shutdown
The program uses a CPU Clock memory, Setting MB100 clock memory, the M100.0 change cycle is 0.1s. Enter the symbol address As I0.1, I0.1 positive edge down counter C0 to set the number, if I0.0 is 1, C0 minus 1 per 0.1s. Output symbol address Q0.0.
When 00002 is turned on, TIM000 start timing, while 10000 is ON; after 0.8s TIM000 normally open contact closure, normally open contact disconnect, TIM001 start timing, while 10000 is OFF;
After 0.6s, TIM001 the normally closed contacts open, TIM000 coil power, the normally closed contact closure, normally open contacts to open 10,000 and is ON; at the same time, TIM001 coil is energized, the normally closed contact is closed. After scanning one cycle, TIM000 coil is energized again, so repeated, 10000 can be obtained at a specific interval on-off output, TIM000 decision on delay time, TIM001 decision off delay time.
TIM000 the timing process, the normally open contacts open, normally closed contact closure;
regular time, the normally open contacts closed, the 10000 output is ON, after a scan cycle, TIM000 normally closed contacts disconnect, so that the coil power, normally open contact and open, so that 10000 is OFF.
In the elevator shaft on each floor is equipped with a magnetic sensors, respectively 1YG, 2YG, 3YG, 4YG, 5YG, while the car is equipped with a side length of the magnet separator plate, if the elevator up from the first floor, then magnet separator plate and then click insert sensor. When the magnet separator plate inserted into the sensor, the sensor inside the reed contact is closed, the corresponding floor control relay 1JZ ~ 5JZ pull.
According 1JZ ~ 5JZ operation, control 1JZ1 ~ 5JZ1 appropriate action. Seen from the circuit 1JZ1 ~ 5JZ1 have pull self-holding function, so 1JZ1 ~ 5JZ1 always has one and only one pull.