User Manual of A90 Series Inverter (a) (b) Fig. 3-12 AI1/AI2 Terminal Wiring Diagram 3.3.3.2 Wiring of the input analog current signal of AI2 terminal: is set to the current mode. When the AI2 terminal is in the mode of analog current signal input, the switch S2 on the terminal block 3.3.4 Wiring of multi-function input terminal Fig. 3-13 Wiring Diagram of External Current Source and AI2 Terminal Among the multi-function input terminals of the A90 series inverter, the common terminal is COM (the terminals COM and GND are connected internally for the A90-4T017B model and below). The digital input terminal and COM are valid when short-circuited and invalid when disconnected (NPN mode) . 40