plcplcplc1
Member
Hello everyone,
I have 3 identical processes controlled by 3 Allen Bradley PLCs (1769-L33ER CompactLogix 5370). All 3 share some identical sensors.
I need to start automatically 3 different motors, but 1 at a time. All 3 motors/plc share identical sensors, so right now if the right conditions are true, all 3 motors will try to start at the same time, but this is not what I want.
The process should behave like this:
If "Auto Mode" is on in one motor, this one will turn on and off depending on conditions.
If "Auto Mode" is on in motor 1 and motor 2, motor 1 has to start first and once it stops, the next one will be available so if conditions are again the right ones motor 2 should turn on and eventually turn off. After this, motor 1 becomes available again and so on.
This behavior would be the same for 3 motors with "Auto Mode" on. First motor 1, then motor 2 and eventually motor 3.
The problem I have is, how can I choose with what motor start if all 3 depend on the same conditions and besides that, they are controlled by independent PLCs?
I was thinking of creating a consumed/produced variable. So if variable is equal to 1, motor 1 is the one with the permission, once it stops this variable changes to 2 and it is consumed by plc 2 that now gives the permission to motor 2....and so on. But I'm not really sure if that would work.
Thanks in advance for any help you can provide.
I have 3 identical processes controlled by 3 Allen Bradley PLCs (1769-L33ER CompactLogix 5370). All 3 share some identical sensors.
I need to start automatically 3 different motors, but 1 at a time. All 3 motors/plc share identical sensors, so right now if the right conditions are true, all 3 motors will try to start at the same time, but this is not what I want.
The process should behave like this:
If "Auto Mode" is on in one motor, this one will turn on and off depending on conditions.
If "Auto Mode" is on in motor 1 and motor 2, motor 1 has to start first and once it stops, the next one will be available so if conditions are again the right ones motor 2 should turn on and eventually turn off. After this, motor 1 becomes available again and so on.
This behavior would be the same for 3 motors with "Auto Mode" on. First motor 1, then motor 2 and eventually motor 3.
The problem I have is, how can I choose with what motor start if all 3 depend on the same conditions and besides that, they are controlled by independent PLCs?
I was thinking of creating a consumed/produced variable. So if variable is equal to 1, motor 1 is the one with the permission, once it stops this variable changes to 2 and it is consumed by plc 2 that now gives the permission to motor 2....and so on. But I'm not really sure if that would work.
Thanks in advance for any help you can provide.