amitss_sam
Member
May be my question is too childish, but can i get all the answers please?
For PID of ML1400, if I right loop update as 0.02 & time mode as STI. Also if I didnt right anything about STI anywhere & my PID instruction is in subroutine, then what will happen? I read the AB manuals, but they say, "When in STI mode, this value (loop update value) must equal the STI time interval value loaded in STI:0.SPM. The valid range is 0.01…10.24 seconds."
Also in manual,
As my PID instruction is in subroutine & I call this subroutine from main ladder then how can I find this time inerval which ideally should I write the same value to loop update.
Tell me if my thinking is wrong.
PS: I am working on the same project that was gone on hold for one month due to some reason.
For PID of ML1400, if I right loop update as 0.02 & time mode as STI. Also if I didnt right anything about STI anywhere & my PID instruction is in subroutine, then what will happen? I read the AB manuals, but they say, "When in STI mode, this value (loop update value) must equal the STI time interval value loaded in STI:0.SPM. The valid range is 0.01…10.24 seconds."
Also in manual,
In the STI mode its written as, "the instruction should be placed in an STI interrupt subroutine. It then updates its output every time the STI subroutine is scanned. The STI time interval and the PID loop update rate must be
the same in order for the equation to execute properly"As my PID instruction is in subroutine & I call this subroutine from main ladder then how can I find this time inerval which ideally should I write the same value to loop update.
Tell me if my thinking is wrong.
PS: I am working on the same project that was gone on hold for one month due to some reason.