S7-300 PID

[Guest bashier.w.g]

Hello Guys ! I have to program a S7-300 PLC which controls a rubber injection machine, the machine has 5 areas which should be heated, 2 areas up to 250 deg. and three areas up to 120 deg, the heating elements controlled by Contactors (Digital output). the areas with 120 deg. are heated by oil, and if overheated the oil should be cooled down by a system which controlled by digital output. which FB should i use FB58 Or FB 59 !!! I need help to assign all parameters for the FB58/9. thanks in advance. Bashier Wattad