Product Overview

The GE IC670MDL644 is a 16-point sinking discrete input module engineered for the GE Series 90 Micro programmable logic controller(PLC)platform.Designed to interface directly with industrial field devices such as proximity sensors,limit switches,pushbuttons,and relay contacts,this module converts 24V DC digital signals into logic-level data usable by the CPU for real-time control decisions.Each input channel on the GE IC670MDL644 features optical isolation from the internal logic circuitry,providing critical protection against ground loops,voltage transients,and electrical noise commonly found in motor-driven or high-power environments.

As part of the compact Series 90 Micro I/O family,the GE IC670MDL644 mounts directly onto baseplates like the IC670CHS101,enabling scalable system expansion without external wiring between modules.Its high-density design—16 inputs in a single-slot width—maximizes I/O capacity within tight panel spaces,making it ideal for OEM machinery,small process skids,and auxiliary control panels.The module includes individual LED indicators for each channel,allowing rapid visual diagnostics during commissioning or troubleshooting.Though developed under GE’s automation division(now part of Emerson),the GE IC670MDL644 remains widely deployed and supported due to its robust construction,straightforward integration,and proven reliability across decades of industrial service.

Technical Specifications

Product Model|IC670MDL644

Manufacturer|General Electric(GE)/Emerson

Product Type|Discrete Input Module(Sinking Type)

Number of Inputs|16 channels,grouped in two banks of 8

Input Voltage|24V DC nominal(operating range:15–30V DC)

Input Type|Sinking(current flows into module from field device)

Input Current|~4 mA per channel at 24V DC

Isolation|Optical isolation between field and logic sides;500 VDC withstand

Response Time|<1 ms typical(configurable via software filtering if supported)

Indicators|Red/green LED per channel(ON=input active)

Mounting|Single-slot on Series 90 Micro baseplate(e.g.,IC670CHS101)

Operating Temperature|0°C to+60°C

Power Consumption|~1.5W from backplane bus

Certifications|CE,UL,CSA

Main Features and Advantages

High noise immunity through optical isolation:Each input channel on the IC670MDL644 is optically isolated from the PLC backplane,effectively breaking ground loops and rejecting common-mode noise from adjacent power cables or variable frequency drives.This ensures stable signal interpretation even in electrically hostile environments like metal stamping lines or conveyor systems with frequent motor starts.

Clear,per-channel diagnostics:The IC670MDL644 features a dedicated status LED for all 16 inputs,providing immediate visual feedback during startup,maintenance,or fault tracing.Technicians can verify sensor activation without probing live terminals—enhancing safety and reducing troubleshooting time.The LEDs remain visible even when the module is installed in deep enclosures.

Optimized for sinking sensor topologies:Designed specifically for use with PNP-type sensors(common in European and global machinery),the IC670MDL644 sinks current from the field device to common,aligning with standard industrial wiring practices.This simplifies integration with off-the-shelf sensors and reduces wiring errors during panel assembly.

Compact and modular architecture:Occupying only one slot on the IC670CHS101 baseplate,the IC670MDL644 delivers high I/O density without sacrificing accessibility.Multiple modules can be daisy-chained on the same base for applications requiring dozens of discrete inputs—ideal for complex machine states like multi-axis positioning or multi-stage batch processes.Its low power draw minimizes thermal load on the backplane,supporting dense I/O configurations without overheating concerns.

Application Field

The IC670MDL644 is extensively used in applications requiring reliable monitoring of binary field conditions across diverse industries.In packaging machinery,it reads signals from bottle presence sensors,cap detection flags,and emergency stop buttons to coordinate filling,capping,and labeling sequences.In material handling systems,the IC670MDL644 interfaces with photoelectric eyes,gate limit switches,and pallet position sensors to manage sortation logic and conveyor interlocks.

In water and wastewater pumping stations,it monitors dry-run float switches,valve position feedback,and door-open safety circuits.Similarly,in HVAC rooftop units,the module acquires fan status,filter clog switches,and freeze-stat signals for automated climate control.The IC670MDL644 is also prevalent in legacy upgrades,where aging relay logic panels are replaced with programmable control while retaining existing 24V DC field devices—minimizing rewiring costs.Its ruggedness and simplicity make it equally suitable for new builds in food processing,agricultural equipment,and small-scale manufacturing cells where uptime and ease of service are critical.

Related Products

IC670CHS101:Baseplate module that hosts the IC670MDL644 and other Series 90 Micro I/O

IC670CPU101:Central processing unit for Series 90 Micro systems

IC670MDL331:8-point relay output module for controlling actuators and alarms

IC670MDL640:8-point sourcing discrete input module(for NPN sensors)

IC670MDL740:16-point sinking output module(transistor type)

IC670PWR101:24V DC power supply module for Series 90 Micro racks

IC670ACC001:Removable terminal block kit for quick field wiring and replacement

Logicmaster 90:Official GE software for programming and configuring Series 90 Micro PLCs

Installation and Maintenance

Pre-installation preparation:Before installing the IC670MDL644,confirm it is seated firmly on a compatible baseplate such as the IC670CHS101 and that the DIN rail is properly grounded.Use shielded,twisted-pair cable for long sensor runs,grounding the shield at the controller end only.Ensure all field devices share a common 24V DC reference and that wiring polarity matches the sinking input configuration—positive to sensor,negative/common to module terminal.Verify that the total input current does not exceed the power supply capacity of the system.

Maintenance recommendations:The IC670MDL644 requires no routine calibration but should be inspected periodically for loose terminal connections,corrosion,or damaged insulation—especially in humid or corrosive atmospheres.Use the channel LEDs to quickly identify stuck or intermittent inputs during preventive maintenance rounds.If a channel fails,check the field device and wiring first before assuming module fault;the optical isolators rarely degrade under normal conditions.When replacing the module,ensure the system is powered down to avoid backplane damage.Store spare IC670MDL644 units in anti-static packaging away from moisture and extreme temperatures to preserve electronic components.

Product Guarantee

Every IC670MDL644 we supply undergoes functional testing on an operational Series 90 Micro test bench,verifying all 16 channels for proper response,LED indication,and communication with the CPU.We guarantee each unit is authentic,free from physical damage,and fully compatible with GE’s legacy architecture.Backed by a 12-month warranty and supported by engineers with hands-on experience in GE automation systems,our IC670MDL644 modules deliver dependable performance for both sustaining engineering and new deployments.We are committed to ensuring your control system remains operational with high-integrity,field-ready components you can trust.

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