Carrier 17/19EX - Manual (Page 272)

Processor Module (PSIO) ( Figure 51 )
Inputs
Each input channel has 3 terminals; only 2 of the terminals are used. Application of machine
determines which terminals are normally used. Always refer to individual unit wiring for terminal
numbers.
Outputs
Output is 20 vdc. There are 3 terminals per output, only 2 of which are used, depending on
the application. Refer to the unit wiring diagram.
Click here for Figure 49 — PSIO Module LED Locations
Click here for Figure 50 — LID Module (Rear View) and LED Locations
Click here for Figure 51 — Processor (PSIO) Module