Hello all,
I am having a weird issue with the output of my PID on a compact logix controller that will not let me input the variable into my reference command to my powerflex 40. I am not so sure this is actually a PID error because everything is working correctly on my PID loop and it actually will scale and give me a correct output on my control variable.
The problem is that I cannot send the output number to my powerflex 40 drive (ethernet) I have confirmed everything is working on communication and can start and stop the drive and recieve status from the drive. but when i MOV a INT into the reference INT the value does not register. (the tag still reads 0 even though the first tag in the MOV is value 630.)
for example, I made an INT tag and placed it in my control variable position on my ladder logic block for PID. when I run the loop the output tag registers 630, which means 63.0 hz reference should be sent to the drive. just under the PID loop I have a MOV instruction that moves the INT tag into the output to the comm-e card and it will not register in this tag.
It is an alias tag, but so are all my other communication tags to the drive so i do not think this is an issue.
I have the PID in a periodic task that executes every 1000ms and the PID does not execute until i am actually telling the drive to run via a XIC bit.
thanks in advance!
I am having a weird issue with the output of my PID on a compact logix controller that will not let me input the variable into my reference command to my powerflex 40. I am not so sure this is actually a PID error because everything is working correctly on my PID loop and it actually will scale and give me a correct output on my control variable.
The problem is that I cannot send the output number to my powerflex 40 drive (ethernet) I have confirmed everything is working on communication and can start and stop the drive and recieve status from the drive. but when i MOV a INT into the reference INT the value does not register. (the tag still reads 0 even though the first tag in the MOV is value 630.)
for example, I made an INT tag and placed it in my control variable position on my ladder logic block for PID. when I run the loop the output tag registers 630, which means 63.0 hz reference should be sent to the drive. just under the PID loop I have a MOV instruction that moves the INT tag into the output to the comm-e card and it will not register in this tag.
It is an alias tag, but so are all my other communication tags to the drive so i do not think this is an issue.
I have the PID in a periodic task that executes every 1000ms and the PID does not execute until i am actually telling the drive to run via a XIC bit.
thanks in advance!
