I/O modules

The GE IC670ALG630 functions as a high-precision thermocouple input module within the Field Control series, connecting directly to Genius PLC systems. This module accepts eight independent temperature signals and processes them for intelligent control applications. It consequently enables distributed temperature monitoring without burdening the main processor.

Physical Characteristics and Build Quality

Engineers constructed this module in a compact Field Control housing suitable for distributed I/O installations. The unit measures approximately 12 centimeters in height, 8 centimeters in width, and 6 centimeters in depth. Its total weight reaches 0.54 kilograms, making it lightweight for panel mounting or DIN rail installation. The rugged enclosure protects internal electronics from industrial contaminants.

Technical Specifications

Channel Configuration and Flexibility

The IC670ALG630 accepts eight differential thermocouple inputs with complete independence between channels. You can mix different thermocouple types across channels without any hardware changes. Each channel configures individually for thermocouple type, input span, and filtering options. This flexibility proves essential for applications monitoring multiple temperature zones.

Thermocouple Compatibility

This module supports virtually all common thermocouple types used in industrial applications. Types J, K, T, and E cover general-purpose temperature measurement from -200°C to 1000°C. Types S, R, and B accommodate high-temperature applications like furnaces and kilns up to 1700°C. Special types including G, C, D, and Platinel II serve niche applications in specific industries.

Input Span Selection

Programmable input spans allow optimization of the measurement range for specific applications. Narrower spans like ±19.5 millivolts provide maximum resolution for low-level signals. Wider spans up to ±625 millivolts accommodate full-range thermocouple outputs without saturation. The 15-bit plus sign resolution delivers fine temperature detail across any selected span.

Accuracy and Stability

The module maintains excellent accuracy through careful design and temperature compensation. Temperature sensitivity remains at ±0.004 percent of reading plus 1.5 microvolts per degree Celsius. This performance ensures reliable measurements even in environments with fluctuating temperatures. Automatic cold junction compensation eliminates errors from terminal temperature variations.

Diagnostic Features

Built-in diagnostics continuously monitor channel health and communication status. Open thermocouple detection identifies broken sensor wires automatically for rapid troubleshooting. The module reports fault conditions directly to the GE Genius bus for operator notification. These features significantly reduce downtime in temperature-critical processes.

System Expansion Capabilities

You can connect up to eight IC670ALG630 modules to a single Bus Interface Unit for expanded capacity. This configuration provides up to 64 thermocouple inputs at one distributed location. The Genius bus handles all data communication automatically without additional programming. Consequently, system designers can scale temperature monitoring to match application requirements.

Power Requirements

The module draws 195 milliamps maximum from the BIU power supply during normal operation. Internal filtering capacitors smooth any power supply ripple that could affect measurement accuracy. Dedicated voltage regulators ensure stable references for the analog-to-digital converter. This careful power design contributes to the module’s excellent temperature stability.

Details