Z13Z19

[Andrei Blagaila]

Hey guys. I have some registers in my program that store the values for the recipes. (ex Z13, Z14...). Somewhere though I have the command:

MOV D921 Z13Z19

Can some explain Z13Z19?

[JRoss]

An indexed index? Didn't know that was possible. Which PLC?

[Andrei Blagaila]

Q50UDEH. Can you please explain what it's used for?

[JRoss]

Z is an index register device. It's used as a pointer to modify the address of the device in front of it. For example, D100 is a data register. D100Z0 is an indexed data register that points to D[100 + Z0]. So if Z0 = 3, then D100Z0 is D103.

I guess the Q lets you index an index register. So Z13Z19 is pointing to Z[13+Z19]. That's a level of crazy I've never tried.

[Andrei Blagaila]

I''m trying to understand why they did it like this. No idea yet :| I'll do some more digging tomorrow

[JRoss]

You said that Z13, Z14, etc. are recipe values? They must point to a lookup table. Try to find where Z19 is calculated, that will give you some clues.

[Ron_S]

It was your syntax that threw us. :)

It actually looks like this  MOV   D921Z13  Z19  which makes it a little clearer

Where the value in indexed register D921 + Z13 is moved into the index register Z19

 

Edited February 14, 2017 by Ron_S

[Andrei Blagaila]

It actually looks like this.

[Ron_S]

Right.  

The ZR11 part is a file register indexed by the value in Z19

ie Z19 = 2

Then the value of D911 is moved into ZR13

 

[Andrei Blagaila]

Now I understand. So the value in Z19 is added to the register number and then in that number D911 is moved.

It's seems like over complicating things. Why is this used?

[Ron_S]

As I said in a post on here only a week or two ago

I have never used file registers but I have come across them in programs.

Only the original programmer can answer your question - or we can all guess :)

[Dariusch]

On ‎14‎-‎02‎-‎2017 at 2:39 PM, Andrei Blagaila said:

It's seems like over complicating things. Why is this used?

I usually use the fileregister [R] or entended fileregister [ZR] when I have to make som sort og recipehandling, datalogging, datatraceing or need of lots of registers for calculating. Also in my opinion a good way of storing data for example program/machine setup.

The [R] registers can be created at the expense of the standard RAM of your CPU (build-in memory) or by using a SRAM-Card for creating up to 1mill. [ZR] extended registers.

Also the registers are latched by default.

Best regards.

Dariusch

[Andrei Blagaila]

Thank you. I understand now. I think it may have to do something with Recipe logging. You all have been a huge help.

Thank you,

Andrei