JAK
Lifetime Supporting Member
Good Afternoon Everyone,
I hope you can help me with a problem. I have been converting a program from a Micrologix 1400 over to a S7-1200 PLC and I have finished most of the program but I am getting hung up w/ the PID conversion. I have been referencing the S7-1200 manual and an application note from 2014 and I find that the literature is not very friendly in Portal. There is a lot of trees spent on utilizing their auto-tune feature but when you have to program the process to accomodate another mode of operation to accomodate the auto tune it is just not worth the effort. I find basic things like is the reset term 1/Ti like in AB or is is Ti, therefore I need to think of the values inversely. Things like the ManualUP and ManualDN parameters just make my head hurt, especially when I have no interest in the feature. Typically in the PID we use the auto/manual bit to engage the PID. WHen the PID is in manual I flush the CV. When in auto I send all the parameters from the HMI to the PID parameters (Kc, Ti, Td, LUT, SP). I was hoping someone out there can help me get to the bottom of this. I am working with the PID compact technology object.
I hope you can help me with a problem. I have been converting a program from a Micrologix 1400 over to a S7-1200 PLC and I have finished most of the program but I am getting hung up w/ the PID conversion. I have been referencing the S7-1200 manual and an application note from 2014 and I find that the literature is not very friendly in Portal. There is a lot of trees spent on utilizing their auto-tune feature but when you have to program the process to accomodate another mode of operation to accomodate the auto tune it is just not worth the effort. I find basic things like is the reset term 1/Ti like in AB or is is Ti, therefore I need to think of the values inversely. Things like the ManualUP and ManualDN parameters just make my head hurt, especially when I have no interest in the feature. Typically in the PID we use the auto/manual bit to engage the PID. WHen the PID is in manual I flush the CV. When in auto I send all the parameters from the HMI to the PID parameters (Kc, Ti, Td, LUT, SP). I was hoping someone out there can help me get to the bottom of this. I am working with the PID compact technology object.