Programmable Automation Controller with 4 I/O Expansion Slots. The ISaGRAF i-8000 Series (I-8437-80/8837-80, I-8417/8817) is an ISaGRAF PAC and includes ISaGRAF SoftLogic, ISaGRAF is a Windows programming tools and also provides powerful debugging tools including Online Monitor and Control and also Offline Simulation. There are more than 300 function blocks built-in the PAC for various Industrial Applications including PID, motion, remote IO, ser..