Plc-5/40 Processor

I need some help in developing plc ladder logic to control speed controls on a servo hydraulic pump controller. The pump will produce 5000psi to a hydrostat that will increase RPM based on howe nuch flow, and what I need is to be able to control the speed of the hydrostat. Speeds will be as high as 3500rpm. I am looking for a basic plc ladder logic that can guide me in the righ direction. I need to have some kind of a PID loop to control speed. The spindle will have mag pick up attached to a 1771-VHSC and there will be an analog card that will control the servo control pump. Need help on ladder logic, thanks.

Here's a LINK to the PLC-5 programming reference, Chapter 14 covers PID loops. Do a little reading and come back with specific questions.

I suggest that we all follow our new member's request in this thread ... apparently he's posting in two threads rather than in one ...