Automation Direct D4-16NA 110VAC Input Module

The Automation Direct D4-16NA is a 16-point discrete AC input module for DirectLogic DL405 PLCs, designed to bring standard 110 VAC field signals into the DL405 backplane. It accepts 80–132 VAC, 47–63 Hz inputs and draws about 14.5 mA at 120 VAC, with two isolated common terminals and eight inputs per common for flexible wiring. A removable terminal block is included (D4-16IOCON), and the module carries UL safety certification (UL File E157382) with a red front-bezel color code identifying it as an input module. The unit requires 5 V base power at up to 150 mA maximum and uses clear on/off thresholds (on >70 V, off <20 V) with response times of 5–30 ms (ON) and 10–50 ms (OFF). In practical terms, this module is well suited for converting 110 VAC field devices—such as limit switches, door switches, pushbuttons, and other sensors—into DL405-compatible digital inputs for reliable industrial control.