Thanks Bruce,

What would be the easiest way to build the circuit with a separate power supply for the optos yet still only have one PCB. I guess I would have to also power the sensor using that same power source.

The final PCB will be mounted in a metal enclosure with 2 ac power inputs. 1 is 16v AC for the main board and the other is 24v AC for an Optical beam sensor.

The 16v AC is converted to DC through a full wave bridge rectifier and then regulated to 5v and 12v through 2 voltage regulators. The 5v is used for the PIC and all logice ICs, the 12v is for the relays and to power external RS485 devices.

There is a total of 3 inputs to the PIC. The first is the Encoder from the gearbox, the second is the Optical beam sensor, and the last is a relay output from the AC Drive Invertor for fault detection.