Quantity PID Controller is dependent on more things (e.g. cycle time, memory, I/O number, ...)

For your calculatin can help the tool "ProTime".
http://www.automation.siemens.com/w2/automation-technology-protime-3749.htm

Regards

Thank you for reply. I have not get access to program.

However, I have heard that I can use function module of PID controller. Can I use about 40 function module for my controllers? All the data of controllers is accessible in my plc for interaction? Should use equipment suach as ET200M to connect these modules?