General Electric IC693CPU311D Series 90-30 Baseplate

The IC660EBA026 is a 24/48 VDC Current-Source Analog Input Electronic Assembly designed for GE Fanuc Genius I/O block systems. It provides processing electronics and signal conversion for six independent 4–20 mA current input channels, allowing PLC and machine controllers to interface with field transmitters and industrial loop devices. The module performs analog-to-digital conversion using voltage-to-frequency conversion techniques, translating measured current loops into digital engineering units for high-speed transmission across the Genius I/O bus network.

Field Input and Channel Isolation

Each of the six input circuits operates independently with isolated channels to prevent ground loops and common-mode interference. The module provides 1500 V RMS channel-to-channel isolation, ensuring dependable signal integrity when connecting multiple field sensors across floating potentials. Standard measuring range spans from 4 to 20 mA, with extended overrange capability up to 25 mA. Integrated excitation power supplies generate 24 VDC loop power to energize external current transmitters directly from the block.

Signal Conversion and Diagnostic Capabilities

The electronic assembly allows programmable input conversion times ranging from 16.6 ms to 400 ms, enabling users to optimize the balance between input resolution and line noise rejection. Longer conversion cycles increase analog resolution up to 1 µA. Built-in diagnostic routines continuously monitor circuit health, generating fault flags for open wire detection, underrange, overrange, and user-configured high or low alarm limits. Detected faults trigger automatic system alerts to connected CPUs and Hand-Held Monitors.

Technical Specifications

System Assembly Requirements

The IC660EBA026 contains the internal electronics processing assembly and requires a compatible Genius I/O Terminal Assembly block to form a complete operational unit. Field wiring terminals, mechanical mounting bases, and block ground pathways are established on the companion terminal assembly, allowing the electronic unit to be inserted or replaced during routine maintenance.

Frequently Asked Questions

Q: What is the primary function of the GE Fanuc IC660EBA026 module?A: It serves as the electronic assembly unit for a 6-channel 24/48 VDC analog current-source input block, powering 4–20 mA field transmitters and converting loop signals for the Genius I/O bus.

Q: Can the IC660EBA026 power external 4–20 mA current loops directly?A: Yes, each of its six isolated input channels includes an internal current loop supply that provides loop excitation voltage for process field transmitters.

Q: What diagnostic faults does the IC660EBA026 report to the PLC controller? A: The module monitors each channel and reports open wire conditions, underrange, overrange, and programmable high/low limit alarm breaches to the central CPU.