couple of problems with 1200 & PID

FreakOnALeash

Hello!

"- What does it mean "PER"?
- What does "PER" stand for?"
PER=PERiphery (it's an analog valve from your process valve sensor respectively for your actuator)

"- I need a simple temperature regulation, input temperature sensor 4-20mA, output regulation valve 0-10V. The user will be able to modify PID parameters like Proportional gain, Integral time, Derivative time by the means of a Touch Panel HMI. But I can't see any way to connect HMI parameters with actual PID parameters, using a DB. How to do it? I see that I can access to the PID internal DB data (i.e. "PID_Cooling".sRet.r_Ctrl_Gain, "PID_Cooling".sRet.r_Ctrl_Td, "PID_Cooling".sRet.r_Ctrl_Ti). But is it possibile to modify those parameter from outside (HMI)?"
Yes, it is possible. You need a analog input signal modul or signal board to calculate your temperature sensor current to the analog value.
http://support.automation.siemens.com/WW/view/en/36932465
A.6.1/A.9.1
To modifyPID parameter create an I/O field onthe screen in your HMI which accesses to the parameter in the PID instance DB.You can see which parameter is accessable by the column "Visible in HMI".

"- What should be the suitable PID mudule for my application? When to use the PID_Compact, when to use the PID_3Step?"
I would prefer the PID_Compact. PID_3Step is for digital valve controlling (open, close, stand still).

"- Where cound I find a PID user guide ?"
the same link; chapter 9.2 or the online help in STEP 7 V11

salrandazzo

But I still can't understand the difference between:

- [Input] and [Input_PER] terminals.
- [Output] and [Output_PER] terminals

Where should I connect my 4-20mA temperature sensor? To [Input] or to [Input_PER] ? Why?
Where should I connect my 0-10V regulation valve? To [Output] or to [Output_PER] ? Why?