Retrofitting old Injection Press

[Al_The_Man]

If you plan to stripped the machine, consider to go with 24vdc input and output. They are safe and wire can be smaller.

I agree with the 24vdc, even for the solenoids, the beauty of DC for solenoids, you do not get the burn-out failure for stuck armatures or somebody pushing them over manually, like you do with AC type.
Also to conserve wiring space, I have gone over to using TR64 instead of TEW as the OA dia. is greatly reduced, still 300v rating.
Its a bit harder to get, but when you have a bundle of 20 or 30 wires, it makes a difference.
Al.

[rkonnen]

For a bare bones PLC try www.trolsystems.com Kind of like PLC for dummies. Not fancy but easy to program. Use some digital temp controls from e-bay or PPEs budget catalog. You got a control for around $1000 or less.
Richard