RSLogix 500: Bit value EQU decimal value?

[khelza]

Hi all,

I am working offline on some code where I am comparing two values.

B3:20 = 0000 0111 (7)
N7:17 = 7

If I compare the two in an EQU function, will it work? Or do they need to be of the same type?

 

[Donnchadh]

Hi

Unlike Siemens this will work
You could also do a MOV instruction of b3:20 to n7:8
And then use the EQU if you wish

Donnchadh

 

[khelza]

Hi

Unlike Siemens this will work
You could also do a MOV instruction of b3:20 to n7:8
And then use the EQU if you wish

Donnchadh

The MOV instruction seems unnecessary in that case, or is it just for my own reassurance?

 

[Mickey]

Hi all,

I am working offline on some code where I am comparing two values.

B3:20 = 0000 0111 (7)
N7:17 = 7

If I compare the two in an EQU function, will it work? Or do they need to be of the same type?

That will work just fine.

Source A must be a word address, source B can be a constant or word address.

 

[daba]

That will work just fine.

Source A must be a word address, source B can be a constant or word address.

Just to clarify....

Source A can be a word (data-table) address, or a constant (literal).

Source B can be a word (data-table) address, or a constant (literal).

The compiler will accept both A and B as literals, but there is no point, that's just silly....

 

[Mickey]

Just to clarify....

Source A can be a word (data-table) address, or a constant (literal).

Source B can be a word (data-table) address, or a constant (literal).

The compiler will accept both A and B as literals, but there is no point, that's just silly....

I disagree See pdf's
But, I don't have a SLC or ML???? to try it. Maybe someone can.

 

[Mickey]

And here is the error message...

 

[Donnchadh]

Hi

Sorry Just to Clarify I said you could also use a MOV instruction and I should have stated as I did not have the software in front of me
Logic 500 is very good at allowing you to mix data types within instructions

Donnchadh

 

[daba]

And here is the error message...

I stand corrected...

Done very little 500 stuff for so long....

Perhaps I just assumed it would be OK, like it is in 5000

 

[Mike_RH]

Try putting the rung in with N7:0 as operand A and the constant as operand B.