Program Minor Fault Help

[Cherokee 96]

Need some help guys
Looked up the error, and this is what I found.please have a look at the attachment.
Monitored the tag, its not being used anywhere else.
I have no idea what this is doing.By the wording of the tag looks like some kind communication scan.I might be wrong(still learning) Its adding the value and writing ,as soon as it goes up more than 32768, the fault shows up. There should be reset I guess.

Thanks

 

[Ken Roach]

ComExtN101[x] must be an INT[x] array tag.

16-bit INT datatypes are always Signed, so they have a range of -32768 to +32767.

Since you are adding 1 to this integer value every scan, you will get this overflow every 32767 program scans.

A simple workaround would be to condition the ADD with a LES instruction so it only executes if the tag is less than 32767.

Then add a rung so that if the tag is equal to 32767, it is set to zero.

 

[Cherokee 96]

ComExtN101[x] must be an INT[x] array tag.

16-bit INT datatypes are always Signed, so they have a range of -32768 to +32767.

Since you are adding 1 to this integer value every scan, you will get this overflow every 32767 program scans.

A simple workaround would be to condition the ADD with a LES instruction so it only executes if the tag is less than 32767.

Then add a rung so that if the tag is equal to 32767, it is set to zero.

Thanks Ken
Problem solved