Siemens SCL to AB RS5000

baz999 · Apr 8, 2022

Hi All,
I need to try and convert some code from Siemens SCL (TIA16) over to Allen Bradley RS5000.

I have attached an image of the SCL and what I have tried to do in RS5000.

Im getting an error: Rung xx,MOV, Operand 1: Invalid date type. Argument must match parameter data type.

so guess I have an issue with the destination being a Bool?

many thanks

Baz

drbitboy · Apr 8, 2022

I think you want to use the OTU instruction.

i.e.



   F106_0   F106_1   ...

----(U)------(U)-----...

baz999 · Apr 8, 2022

OK I have a look, is the "--(U)--" an unlatch? would this still work on a standard Bool if i'm not latching?
Thanks

drbitboy · Apr 8, 2022

Yes, OTU, visually -(U)-, is unlatch a.k.a. reset; that is one of the typical ways to assign a 0 to a single bit in AB RS5000.

MOV is definitely not a way to write to a single bit.

baz999 · Apr 9, 2022

Thanks drbitboy, I've also just come across structure text which looks similar to the Siemens SCL, but think you way would be visually easier to see/fault find later.
Many thanks for your help.
Baz

cardosocea · Apr 9, 2022

Does it have to be ladder?

RVaughan · Apr 9, 2022

drbitboy said:
Yes, OTU, visually -(U)-, is unlatch a.k.a. reset; that is one of the typical ways to assign a 0 to a single bit in AB RS5000.

MOV is definitely not a way to write to a single bit.

Does Logix have an invert write instruction nowadays?

--(/)--

I think this or a

--[NOT]--( )-

would be preferable, due to the varied behavior of the OTL/OTU instructions. (Though I could be remembering their behavior as more complicated than it truly is.)

lostcontrol · Apr 10, 2022

It would of made much more sense to declare F106 as a INT & reference the same corresponding bits.
Then you could just MOV #0 F106 OR CLR F106 when the flags are required to be reset.
This is of course assuming all the bits in F106/107 are used for manual controls..

Some might chime in say a DINT data type
Would be better for CLX conversion.. &#55357;&#56846;

drbitboy · Apr 10, 2022

lostcontrol said:
...declare F106 as a INT...

I thought of that, but not all the bits were being addressed, so I figured the few OTUs were quicker to implement than explaining an MVM.

Also, at this point, the rest program has already been ported to ladder, so changing to BOOLs to the bits in an INT or DINT might take a significant refactoring effort.

But yeah, going in at the start this would have been a better solution for this part.

baz999 · Apr 16, 2022

Thanks for all your support (I've been off with COVID for a few days so not been looking at).
Original program was an old S5 approx 40yrs old, someone had started to convert to TIA16 but then left, now I've been asked to convert the TIA16, to Allen Bradley. I've read up on some of the ST commands and am thinking of just listing them all like: F106.0 := 0;
Regards

lostcontrol · Apr 16, 2022

If the bits of ‘F106’ are only used for manual commands and can be cleared at the same time, you could even just use F106 := 0;

Siemens SCL to AB RS5000

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