GX developer Z0 and RxxxZ0 registers

dmta

Member
Join Date
Sep 2015
Location
Tyhk
Posts
7
Dear all,

I have this sort of registers being accessed in a PLC ladder diagram that I am looking at these days.

M8000
-----| |------[MOV R900Z0 D400]

~~~~~

M8000
-----| |-------[MOV D301 Z0]

What are these R900Z0 and Z0 registers? Where can I find the section about these in the fx-3u programming manual? It seems Z is used for some pointer operation but that's all I could find.

Best regards.
 
dmta

in GX Developer Z & V are indexes and work as follows

the value of an index is moved in to the index register
[MOV D1 Z1],
this moves the value of D1 into Z1
if D1 is 10 then Z1 will be 10

The register can then be used
[MOV D900Z1 D400]
this means Move the value register D900 + Z1 to D400, so if Z1 = 10 then Move the value of D910 to D400.

So the index changes the register to be read, not the value in it.
 
M8000
-----| |------[MOV R900Z0 D400]

This means move the value in R900 into D400
But the Z0 has a separate value which is decided by the MOV D301 instruction

For instance, if D301 was 10, then 10 is moved into Z0

so now
M8000
-----| |------[MOV R900Z0 D400]

means MOVe R900+10 which is now the value in R910 into D400
 
dear all,

Thank you for the quick response... the Z is used so that by changing the index you can decide which register you are accessing.

Can you also tell me what type of register "R" refers to?

Best regards :)
 
R registers are just normal registers (Like D registers)
The only difference I know of is that they can't be retained - more like working registers.
 

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