rslogix 500 problem

[Mickey]

plz i need an answer about this questions urgently

Here is a link to the manual. All your questions can be answered there. As widelto pointed out. Chapter 19 for the PID and page 242 for the "STI"

http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1762-rm001_-en-p.pdf