ABB BAILEY INFI 90 NTAI06 MODULE

Input Circuit Description

When an input signal is present at the proper voltage level, a zener diode conducts (turns on) to cause current flow through an optocoupler. Configurable jumpers (on IMDSI22) or fixed resistors (on IMDSI13, IMDSI14 modules) select the turn-on threshold and input voltage.

The optocoupler output causes a comparator output to go low. This lights a corresponding status LED on the module front panel to indicate an energized input. The I/O expander bus interface transmits a logic one to the controller on the I/O expander bus. When no input signal is present, no current flows through the optocoupler. The front panel LED does not light and the DSI module transmits a logic zero on the I/O expander bus

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