I/O modules

Module Functionality

The GE IC670ALG620 RTD input module interfaces resistance temperature detectors with Field Control PLC systems. This intelligent unit converts temperature signals into digital values for processor interpretation. It supports multiple RTD types for versatile temperature measurement applications. Process engineers rely on this module for accurate thermal monitoring in industrial environments.

Input Channel Configuration

The GE IC670ALG620 provides 8 differential RTD input channels for temperature sensing. Each channel accepts 2-wire or 3-wire RTD connections. The module supports platinum, nickel, and copper RTD types. Software configuration assigns specific sensor types per channel individually. This flexibility accommodates mixed sensor installations without hardware changes.

RTD Compatibility and Ranges

The module works with Pt100 (385 and 392 curves) and Pt200 RTD sensors. It also supports Ni100 and Cu100 RTD types for diverse applications. The measurement range spans -200°C to +850°C for platinum sensors. Each channel provides 16-bit resolution for high-precision temperature readings. This broad compatibility suits most industrial temperature monitoring needs.

Accuracy and Signal Processing

The GE IC670ALG620 achieves ±0.2°C accuracy for Pt100 sensors. It provides ±0.5°C accuracy across the full measurement range. The module samples each channel sequentially with 100-millisecond conversion time. Digital filtering eliminates power line noise for stable readings. This precision ensures reliable temperature control in critical processes.

Sensor Excitation and Lead Compensation

The module supplies constant current excitation for each RTD input. Current sources deliver 0.5 milliamperes for platinum and nickel sensors. For copper RTDs, the excitation increases to 1.5 milliamperes. The module automatically compensates for lead resistance in 3-wire connections. This feature eliminates errors from long cable runs.

Communication with Field Control Bus

The GE IC670ALG620 exchanges data through the Field Control system bus. It transfers temperature values and diagnostic information to the processor. The module supports block transfer for efficient data exchange. Configuration software maps each channel to a specific memory address. This integration ensures deterministic temperature data updates.

Physical Dimensions and Mounting

The module measures 80 millimeters in width, 100 millimeters in height, and 55 millimeters in depth. The unit weighs 0.3 kilograms for lightweight installation. It mounts directly onto the Field Control terminal base. A locking clip secures the module firmly to the base unit.

Power Consumption Requirements

The GE IC670ALG620 draws 150 milliamperes from the 5 V DC backplane supply. It requires no separate external power source for operation. Total power dissipation reaches 0.75 watts under typical conditions. The low consumption reduces heat generation inside cabinets. This efficient design supports high-density configurations.

Field Wiring and Connector Details

A 20-pin removable terminal block accepts all field sensor connections. The terminals handle wire sizes from 0.2 to 1.5 square millimeters. Each channel includes dedicated shield terminals for cable screening. The connector block features clearly labeled terminals for RTD wiring. This organized layout simplifies installation and maintenance.

LED Status Indication

A green LED indicates proper module operation and backplane communication. A red LED signals any channel fault or configuration error. Each channel has a dedicated LED for over-range indication. The indicators provide immediate visual feedback for troubleshooting. Operators can quickly identify faulty sensors or wiring issues.

Environmental Specifications

The module operates between 0°C and 60°C ambient temperature. It withstands 5% to 95% non-condensing humidity conditions. The unit meets UL 508 and CSA industrial safety standards. Its IP20-rated housing protects against accidental contact. The conformal-coated PCB resists moisture and contaminants.

Technical Specifications Table

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