RSLogix5000 Add # to array value

Hey guys. Is there a simple instruction to add a value to each of the values contained in an array. I'm messing with the FAL, but can't seem to get it to do what I want.

What I need to do is add a certain value to an array. Let's say certain value =1.

Before, the array values would be
1
2
3

After,
2
3
4

It appears to me that the FAL instruction should do this, but I haven't figgered er out yet.

From the FAL online help, this is what you want

Ian

Thanks for the help. I needed to scroll down farther. Unfortunately, it appears that this instruction will not do what I want in one scan.

Other way would be to use a loop. That way it is done in one scan

Ian

I haven't used that instruction in C-Logix, but in a PLC5 there is a mode choice that will cause the operation to be performed completely in one scan.

You should look again at the various modes available before you rule out the FAL instruction.

Yes,

Use All Mode to complete in one scan. Note though that the operation does not wait to complete before the scan moves on. In ALL mode it will complete in one scan.

For example if you needed to add 1 to 500 values in the array.

In All mode the rung would need to go from false to true once and all 500 values would be operated on in that scan.

Numeric mode (enter a number in the mode field) requires the instruction to be triggered one time only and it will complete that many operations per scan. So if you entered a mode of 50 then the rung would only need to go from false to true once but it would take 10 scans to complete. Even if the rung went false it would continue to finish operating until complete.

Incremental mode will perform only one operation each time the rung goes from false to true. This would require the example mentioned above to be triggered 500 times in order to complete.
OG

FAL mode

More Details about the "mode" I learned the hard way

Mode ALL - calculation is performed on all array members in one scan
Mode INC - calculation is performed on ONE array member per scan, Control.POS is the current array index
Mode numeric X - calculation is performed on X array members per scan eg .LEN = 60, Mode = 6 requires 10 scans. Also Control.Pos increments by 6 per scan.

Operaghost

Note though that the operation does not wait to complete before the scan moves on

Click to expand...

I didn't have that problem with a 500 element array - Look at the execution scan time of the FAL in a L61,L62,L63

From V15 Instruction Execution Time and memory use:

FAL​

x = number of elements manipulated in one scan​

e = time for the operators in the expression (same as CPT)​

4.5 + (x * (1.6 + e) us​

​

Click to expand...

russrmartin - If you give up on the FAL try a Structured text subroutine loop

Had to mess with it

Selecting all did the trick. Thanks guys.