Index register don't work with float or dword variable

[ducna]

Hi everyone,

Continue in the journey to conquer MELSOFT. 

I created a function block with some in/out. The In/Out has data type Word. I can assign the index as D0Z0, D1Z0...

But with In/Out having float or Dword data type, the program says the data is not suitable for variable.

What can I do in this case?

My fallback is to put it all back to the Word data type (that's stupid @@). 

Have a good day!

Edited August 4, 2023 by ducna

[Gambit]

If  the input output is defined as word than a word schould be connected.

But it you want to PLC to process as something else you need to use the INT2..... instructions

[ducna]

Hi @Gambit

Thanks for your reply.

I mean when I use D0Z0, the program automatically assigns the word data type on device D0.

But actually I want to use data type Float or DWORD on memory area D0. 

Is there a way to specify D0Z0 with float data type?

For example:

FB_Unit (variable1:= D0Z0);

Variable1 is input with floating point data type.

Then D0Z0 is not suitable with Variable1.

[Gambit]

You should not use D0 anyway, That is from the past.

Use variables instead of devices

Create an array instead. Zo can be  any defined word.

MyArr[Myponter]

 

 

Edited August 4, 2023 by Gambit

[ducna]

Hi @Gambit

Thats a great idea.

The problem has been resolved.

Thank you very much! 

[Gambit]

excellent 

[ducna]

Hi @Gambit,

A little error in the working process. I cannot assign variable with Z0 in LADDER program.

Do you know any way?

Thank you.

[ducna]

I have found a document it show that it is not possible to call array data directly in LADDER.

https://www.youtube.com/watch?v=mAe_hcGpuAs

[Gambit]

When using arrays you do not need to use Z0. This was only used when using direct devices like D100Z0.

Sorry for the late reply i was on holiday

 

Edited August 29, 2023 by Gambit

[ducna]

Hi @Gambit

Because I need to handle about 1000 I/O and meet the project schedule. So I need register Z0.

I noticed FX 3G CPU can't use array data type. I can't call tag in the statement. :))

[Gambit]

Z0 is not neccesarry when using lables 

Sure you can.  Are you using GX Works 2 structed type project ?

 

[ducna]

Hi @Gambit

Sorry for late reply.

I'm using GX works 2 simple project with use label.

I find it impossible to use the array data type in the ladder language. So I found a way to handle it gracefully with a ST language section.