Pointers
- Thread starter s7xp.com
- Start date
L D[AR2P#0.0]
Lifetime Supporting Member
Use the following to access V 10.0
LAR1 DW#16#87000000
+AR1 P#10.0
LAR1 DW#16#87000000
+AR1 P#10.0
PeterW
Member
An example of using V type.
I have sent into a block a parameter which is the pointer to a start of a data area, once inside the block I then want to block transfer from the area pointed to, into the TEMP area of the block.
Before calling SFC20, I set up the pointers to both areas, but as the TEMP area is on this block, not SFC20, then I have to change the area to V type in my pointer.
SFC20 will then move the data, into the TEMP area of the calling block.
I have sent into a block a parameter which is the pointer to a start of a data area, once inside the block I then want to block transfer from the area pointed to, into the TEMP area of the block.
Before calling SFC20, I set up the pointers to both areas, but as the TEMP area is on this block, not SFC20, then I have to change the area to V type in my pointer.
SFC20 will then move the data, into the TEMP area of the calling block.
L D[AR2P#0.0]
Lifetime Supporting Member
Referencing the V area is almost always done by loading an address register with a pointer to the area. For example, say pPointer is a parameter of type pointer (it can be a parameter of an FC or FB),
Code:
L P#pPointer
LAR1 //ar1 will now contain Vx.y
L W[AR1,P#0.0] //this retrieves the db number from the V area
L D[AR1,P#2.0] //this retrieves the area pointer from the V areaPeterW
Member
You've totally confused me there Simon.
As I understand it and have used it, the V area points to the TEMP area of the previous OB/FC/FB that you were in.
If you load P#pPointer and #pPointer is a TEMP, then the resultant pointer would be to the local TEMP area, not the previous TEMP area.
I'm not sure I understand your statement at all.
As I understand it and have used it, the V area points to the TEMP area of the previous OB/FC/FB that you were in.
If you load P#pPointer and #pPointer is a TEMP, then the resultant pointer would be to the local TEMP area, not the previous TEMP area.
I'm not sure I understand your statement at all.
L D[AR2P#0.0]
Lifetime Supporting Member
Sorry for the confusion, my original post is incorrect in that different processing applies between FC's and FB's
Here's an example of a call to an FC with an input parameter of type pointer.
Here's a similar example but with an FB:
Here's an example of a call to an FC with an input parameter of type pointer.
Here's a similar example but with an FB:
Last edited:
L D[AR2P#0.0]
Lifetime Supporting Member
None of the editors allow you to enter a V area pointer (because it is only used at parameter transfer time), so if you want the DB to contain a V area pointer then download the DB to the simulator(or a real plc), insert the data using a VAT table and then copy the DB from online to offline.
Why do you want to insert the V area pointer this way ?
Why do you want to insert the V area pointer this way ?
Last edited:
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