Is the Bytronic ICT3 Conveyer Synchronized with PLC Scan Time?

[Connorm1]

Homework Statement

So basically im programming for my studys on the Bytronic ICT3 via ladsim. I have everything sort of working but the method in which i have used for accepting/rejectiing just isn't reliable enough and i don't know how i can further improve it.


I've tried to make the conveyor for OP4 act as a kind of encoder but i think my scan timer for the bit shift isn't good enough but only having 16 bit address I'm limited.


This is my current layout for the rungs.


Rung 7 - --||IP8--|/|IP3-----( )R1(bit0)
Rung 8 - --||O4(conveyor)--|/|T2------( )T2
Rung 9 - --||T2----------( )R1/0
Rung 10- --|/|R1(bit 8)--||IP5-----( )O3


So what we have in this sequence is IP3 (Ring assembled) High signal and IP8(Belt peg detected) low signal. IP4 is component detect. OP3 is reject cylinder and IP5 is reject sensor. OP4 is the second conveyor.


As above this works but every so often the timings will be off causing it to reject when it shouldn't (potentially bit gone past/or bit hasn't been met)

Relevant Equations

None.

Attempt as above. image attached of Bytronic ICT3

 

[Tom.G]

A scan clock ticks each time a program scan is completed (or every other scan depending on implementation.) Does the conveyer free-run at its own speed or is it somehow locked to the PLC scan time?

Cheers,
Tom