Hi everyone, I've been tasked with writing a simple PLC program to control 3 motors which turn on and off in sequence.
Here is the brief:
The problem is a conveyor belt system that comprises of 3 conveyor belts, each driven by a separate motor : M1, M2, M3 and must meet the following specifications
Starting:
∑ One pushbutton must start the motors in the sequence M3, M2, M1. This ensures that material from the previous belt is carried off before more is added
∑ M3 must start immediately when the start button is pushed
∑ After a 20 second delay M2 must start
∑ After another 20 second delay M1 must start
Stopping:
∑ One push button must stop all motors in reverse order : M3, M2, M1 to allow material to be cleared from the belts
∑ M1 must stop immediately when the stop button is pressed
∑ After a 20 second delay, M2 must stop
∑ After another 20 second delay M3 must stop
Start button must be N.O
Stop/Reverse Button must be N.C
Emergency Button must be N.C
I've gotten this far but i cannot get the stop button to turn off the M1 and have it stay off in order to set up my timers to turn off the remaining 2. Any help at all would be welcomed!
Thanks
Here is the brief:
The problem is a conveyor belt system that comprises of 3 conveyor belts, each driven by a separate motor : M1, M2, M3 and must meet the following specifications
Starting:
∑ One pushbutton must start the motors in the sequence M3, M2, M1. This ensures that material from the previous belt is carried off before more is added
∑ M3 must start immediately when the start button is pushed
∑ After a 20 second delay M2 must start
∑ After another 20 second delay M1 must start
Stopping:
∑ One push button must stop all motors in reverse order : M3, M2, M1 to allow material to be cleared from the belts
∑ M1 must stop immediately when the stop button is pressed
∑ After a 20 second delay, M2 must stop
∑ After another 20 second delay M3 must stop
Start button must be N.O
Stop/Reverse Button must be N.C
Emergency Button must be N.C
I've gotten this far but i cannot get the stop button to turn off the M1 and have it stay off in order to set up my timers to turn off the remaining 2. Any help at all would be welcomed!
Thanks