Following the introduction of Universal Controller parts for the Basic Controller and RCD, Honeywell introduced this limited version of the original Hiway processor card.

This processor will not work in the Basic Controller or RCD, but was intended for service in the following boxes: HLPIU, LLPIU, LEPIU, OP Station.

This card contains the microprocessor that does the processing for these hiway devices. A single red LED on the card edge indicates that the procesor is running.

The original, unconstrained version of this processor, the 30731832-001, is still available from WPC, and can be used in the Basic Controller and RCD in addition to the PIU boxes listed above.