GE IC693MDL645

Product Overview

The GE IC693MDL645 is a reliable 16‑channel DC positive/negative logic input module designed for use in GE Fanuc Series 90‑30 PLC systems. It functions as an interface between field input devices (like sensors and switches) and the PLC processor, converting real‑world 24 VDC signals into internal logic status for control and automation tasks.

Despite being discontinued in many markets, this module remains widely used in retrofits, system upgrades, and maintenance of legacy industrial control installations.

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Technical Specifications

Parameter	Specification
Part Number	IC693MDL645
Manufacturer	GE Fanuc (Emerson Automation Solutions)
Series	Series 90‑30
Module Type	Positive/Negative Logic Input Module
Input Voltage Range	0–30 VDC (nominal 24 VDC)
Number of Inputs	16 discrete channels
Input Current	~7 mA typical at rated voltage
Response Time	~7 ms ON, 7 ms OFF
Isolation	~1500 VDC between field and logic sides
Mounting	Installed in a compatible Series 90‑30 baseplate
Power Consumption	~80 mA @ 5 VDC (backplane) + 125 mA @ 24 VDC
Indicators	LED status for each input channel
Dimensions	Approx. 142 × 30 × 130 mm
Operating Temp.	0–60 °C industrial range
Compatibility	All GE Series 90‑30 PLC CPUs and racks

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Key Features

• Dual Logic Flexibility — Supports both positive (sourcing) and negative (sinking) logic inputs, allowing connection to a wider range of switch and sensor types.

• High Channel Density — With 16 discrete channels in a single‑slot module, it optimizes cabinet space and reduces panel complexity.

• Electrical Isolation — 1500 VDC isolation protects the PLC backplane from spikes and ground loops.

• Visual Diagnostic LEDs — Individual LEDs help operators and technicians quickly identify input states and simplify troubleshooting.

• Robust Industrial Design — Built for continuous service in factory floors and control rooms with a wide operational temperature range.

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How It Works

When field devices (like pushbuttons, limit switches, or proximity sensors) send 24 VDC signals to the module, each input channel processes the signal based on its configured logic type and updates the status in memory for the PLC CPU to use in control logic. The LED above each channel visually represents the ON/OFF condition in real time.

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Typical Applications

The IC693MDL645 is widely used in industrial automation applications, including:

• Machine control and material handling systems

• Manufacturing line integration

• Process monitoring and discrete control

• Retrofits of aging Series 90‑30 PLC installations

• OEM systems using GE PLC architectures

  
  

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Installation & Maintenance

The module installs easily into a Series 90‑30 baseplate or rack slot. Installation involves proper alignment with the backplane and secure wiring to discrete input devices. Maintenance is minimal — periodic inspections of terminal connections and LED indicators are typically sufficient to ensure reliable operation.

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Modern Considerations

While the IC693MDL645 has been succeeded by newer I/O platforms (such as GE RX3i or RXi series), it remains a valuable component in legacy systems where continuity and service longevity are priorities.