GE IC693MDL240D 120V AC Input Module

This input module captures AC signals from field switches and sensors. It works as a reliable interface for GE Fanuc Series 90-30 PLC systems. You can use this unit for legacy machines with 120 VAC control circuits.

Technical Specifications

Parameter	Value
Model	GE IC693MDL240D
Category	120 Volt AC Input Module
Number of Inputs	8 points
Input Voltage Range	85–132 VAC
Nominal Voltage	120 VAC
Input Frequency	50–60 Hz
Input Current per Point	12 mA typical at 120 VAC
OFF-State Voltage	0–20 VAC
ON-State Voltage	74–132 VAC
Response Time (OFF to ON)	25 ms typical
Response Time (ON to OFF)	40 ms typical
Isolation	1500 VAC (optical between field and logic)
Internal Power Draw	70 mA from +5 VDC backplane
Dimensions (H x W x D)	14.0 cm × 11.4 cm × 5.6 cm
Weight	0.35 kg (0.77 lbs)
Connector Type	One 18-pin screw terminal block
Component Count	1 PCB + 8 optoisolators + 8 resistors + 8 LED indicators
Input Impedance	10 kΩ per channel
Energy Storage	47 µF smoothing capacitor per input

Input Design and Signal Detection

Each input point uses an optoisolator to separate the AC field from the logic side. A red LED on the front panel illuminates when the corresponding input turns ON. The GE IC693MDL240D includes a zero-crossing detection circuit for reliable switching. This design prevents false triggers from electrical noise or contact bounce.

Performance Characteristics

This module detects a valid ON signal between 74 and 132 VAC. Any voltage below 20 VAC registers as an OFF state. Each input draws only 12 mA of current from the field device. Consequently, you can connect most AC proximity switches and limit switches directly.

Response Time and Filtering

The module turns ON within 25 milliseconds after detecting an AC signal. It turns OFF within 40 milliseconds after the signal disappears. A built-in filter smooths out half-cycle drops and momentary interruptions. Therefore, you do not need external debounce circuits for mechanical contacts.

Installation and Wiring

Mount this module into any I/O slot of a Series 90-30 rack. The 18-pin terminal block accepts solid or stranded wires from 14 to 22 AWG. For best results, use separate conduits for AC input wiring and DC signals. You should also connect the neutral terminal to the AC supply return.

Visual Diagnostics

Eight red LEDs sit on the front panel for easy troubleshooting. Each LED lights up when its corresponding input receives an AC voltage. Consequently, technicians can verify field device status without a multimeter. A single green LED indicates that the module has backplane power.

Why Choose This Input Module

This module replaces older IC693MDL240 units without any programming changes. Its 8-point density matches most legacy machine designs perfectly. Therefore, this module suits conveyor systems, packaging lines, and HVAC equipment.