RS500 program question

[grider75]

Program is using a DIV block with source A as F8:[N10:16]
and destination N9:[N10:17] How does this addressing work?

 

[Bit_Bucket_07]

Program is using a DIV block with source A as F8:[N10:16]
and destination N9:[N10:17] How does this addressing work?

That is indirect addressing. If the Integer word N10:16 has a value of five, then the first operand in the divide function will be F8:5, and if N10:17 has a value of 10 then the result of the divide function will be placed into N9:10.

You may dynamically change the values in the N10 registers to have the same divide function use different operands on different scans of your program logic.

 

[MichaelG]

this is called indirect addressing

if (for example) N10:16 = 8 and N10:17 = 30 then
Source A is F8:8 and the destination is N9:30


Aww beaten to the finish line

 

[grider75]

OK, Why 5 and 10? Is that a hard coded thing?

 

[grider75]

OK, that makes sense. Thanks MichaelG

 

[Bit_Bucket_07]

OK, Why 5 and 10? Is that a hard coded thing?

No. Merely random examples. As I said, you may dynamically change these numbers within your program logic (or from an HMI) to change the operands for the divide function.