GE IC693MDL645D Input Module

The GE IC693MDL645D monitors 16 discrete AC signals for Series 90-30 PLCs. This input module accepts 120 VAC field devices like limit switches and sensors. You will find it in industrial control panels and automation systems. It provides optical isolation between field wiring and the logic backplane. Therefore, this module protects the CPU from electrical noise and surges.

This module measures 140 mm in height and 32 mm in width. Its depth reaches 130 mm for standard rack mounting. The unit weighs approximately 0.28 kilograms. It contains 16 independent optocouplers for channel isolation. Each channel uses a 120 VAC input with 3 mA of current. Additionally, you get one LED per channel for visual status indication.

Key Technical Specifications

Parameter	Value
Manufacturer	GE Fanuc Automation
Model	IC693MDL645D
Product Type	Discrete Input Module
Number of Inputs	16
Input Voltage	120 VAC (50/60 Hz)
Input Current	3 mA per channel
Off-State Voltage	20 VAC maximum
On-State Voltage	74 VAC minimum
Response Time	15 ms (on/off)
Isolation Rating	1500 VAC (optical)
Height	140 mm
Width	32 mm
Depth	130 mm
Weight	0.28 kg
Internal Components	16 optocouplers
Status LEDs	16 (one per channel)
Energy Storage	≈ 100 µF (capacitive)
Operating Temperature	0°C to +60°C

Internal Architecture and Energy Storage

The GE IC693MDL645D stores minimal energy in its input filter circuits. Small ceramic capacitors hold approximately 100 microfarads total. These capacitors debounce noisy contact signals effectively. Sixteen optocouplers provide complete electrical isolation for each channel. When an input receives 120 VAC, its internal LED turns on. This light activates a phototransistor, signaling the backplane. The module also includes a bridge rectifier for AC-to-DC conversion. Each channel has an independent RC filter for noise suppression.

Connection Interfaces and Wiring Details

You will find a 20-pin removable terminal block on the bottom. This block accepts 16 input wires plus two common returns. Connect the 120 VAC hot wire to the channel terminal. Then, connect the neutral wire to the common return terminal. Use 16 to 22 AWG copper wire for all field connections. The GE IC693MDL645D does not require external power for inputs. The 120 VAC field supply powers the optocoupler directly. Sixteen green LEDs light up when their respective input is active. Each LED provides quick visual feedback for troubleshooting.

Installation and Configuration Steps

You slide this module into any I/O slot of the Series 90-30 rack. First, align the module with the upper and lower card guides. Then, push it firmly until the backplane connector seats. Secure the front panel with the retaining screw. Connect all field wiring before applying power to the system. The GE IC693MDL645D automatically configures itself after power-up. No jumpers or dip switches require manual setting. Use the PLC programming software to monitor each input state. The module consumes 120 mA from the +5 VDC backplane supply. Always verify that the field supply matches 120 VAC nominal.