looping

[christophertedjo]

how to make looping in ladder logic?

but i want to make the data +1 each time until 3 and return back to 0 after reaching 3.

[Crossbow]

There are FOR NEXT loops in most Mitsubishi PLCs.  Or you can use JUMP, but a loop is a better choice.

[Luke.S]

-----Mov K0 D0

-----[FOR K3]

-----INC D0

-----[NEXT]

D0 will be 0,1,2,3. This will happen every scan and you will only be able to use the final evaluated value D0=3 (unless you move the intermediate values to other locations using index registers).

[Andrei Blagaila]

I use a more basic but time consuming method.

MOV K0 D0

=K0 D0

Instructions and after MOV K1 D0

=K1 D0 Instructions and after MOV K2 D0

=K2 D0 instructions and after MOV K3 D0

=k3 D0 -> Mov K0 D0 

And it goes in a loop

[Bryll]

21 hours ago, christophertedjo said:

how to make looping in ladder logic?

but i want to make the data +1 each time until 3 and return back to 0 after reaching 3.

I suspect that you would like to do something in your program depending on the value in your counting register.

Then you might want to increment the value after a time delay or perhaps a status change.

This will change your value after one seconds delay.

|--(M8013)--[INCP D0]- Increment value in D0 on rising edge of M8013 (Seconds pulse in the FX systems)

|--(D0 > K3)--[RST D0]- Clear D0 if the value of D0 is greater than 3.