The 8851-LC-MT is a specialized high-precision Load Cell Input Module, primarily utilized within the GE Fanuc Series 90-30 Programmable Logic Controller (PLC) ecosystem. It is engineered to interface directly with industrial weight-sensing equipment, converting analog signals from strain gauge load cells into digital data that the PLC can process for precise weighing, batching, and force measurement applications.

Technical Specifications

• Module Type: Analog Load Cell Input Module.

• Input Compatibility: Designed for 4-wire and 6-wire strain gauge load cell configurations.

• Excitation Voltage: Provides stable, regulated excitation voltage to power the attached load cells.

• Dimensions: Standard Series 90-30 I/O module form factor (approximately 5.0 inches x 4.5 inches x 2.0 inches).

• Weight: Approximately 0.35 kg (0.77 lbs).

• Country of Origin: United States.

Application Fields

⚖️ Industrial Weighing: Used in platform scales, hopper scales, and conveyor belt weighing systems. 🏭 Manufacturing: Essential for precise material dosing and batch control in chemical and food processing. 🏗️ Force Measurement: Integrated into tensile and compressive testing machinery for quality assurance.

Product Usage Instructions

💡 Wiring: Connect the load cell signal wires (Excitation +, Excitation -, Signal +, Signal -, Shield) to the terminal block as specified in the module’s wiring diagram. 🛠️ Calibration: Use the PLC’s configuration software to perform “zero” and “span” calibration once the mechanical load cell is mounted and leveled. ✅ Setup: Configure the module registers in the PLC software to define the input range, filtering parameters, and scaling values to match your specific weighing application.

Common Questions & Answers

Q: Why is my weight reading fluctuating significantly? A: Fluctuations are often caused by electrical noise or improper shielding of the load cell cables. Ensure the cable shield is grounded correctly and kept away from high-voltage AC lines. Q: Can I connect multiple load cells to one 8851-LC-MT module? A: Yes, provided the total excitation current draw of all connected load cells does not exceed the module’s rated output capacity. Q: What is the benefit of a 6-wire configuration over a 4-wire? A: A 6-wire configuration includes “Sense” lines that allow the module to compensate for voltage drops over long cable runs, resulting in much higher accuracy.

Product Maintenance Instructions

Regular maintenance of the load cell interface includes verifying the integrity of the terminal block connections, which can loosen due to factory vibrations. Periodically verify the accuracy of the system by using known calibration weights to check for “drift” in the readings. Keep the module clean and dry; if the environment is humid, ensure the enclosure is properly sealed to prevent corrosion on the PCB connectors.

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