GE Fanuc IC660BBA101 115VAC/125VDC Genius RTD Input Block

The IC660BBA101 is a 115 VAC / 125 VDC powered Resistance Temperature Detector (RTD) Input Block engineered for GE Fanuc Genius I/O distributed automation systems. It interfaces directly with field-mounted RTD temperature sensors, converting high-accuracy resistance measurements into digital temperature engineering units. Configured with six input channels arranged in three isolated groups of two circuits each, the block executes continuous temperature processing and transfers digitized data to central controller CPUs or Hand-Held Monitors (HHM) via the Genius serial bus network.

Circuit Topology and Sensor Support

The six input channels support 2-wire, 3-wire, or 4-wire RTD element configurations, accommodating Platinum (DIN 43760 standard), Nickel (DIN 43760 standard), 10-ohm Copper, or direct linear resistance inputs up to 5000 ohms. Arranging circuits into three isolated pairs provides 300 V group-to-group isolation and 1500 V block-to-block isolation, eliminating common-mode voltage offsets across field sensor locations. An internal multiplexer cyclically routes channel signals and precision reference resistors into an A/D converter, yielding a measurement resolution of 0.1 deg C without requiring manual zero or span calibration.

Signal Processing and System Diagnostics

The block features programmable input filter and update cycles of 400 ms, 800 ms, or 1600 ms, allowing operators to match temperature response speeds against electrical noise filtering requirements. Integrated self-diagnostics continuously monitor channel health and hardware integrity, automatically detecting open wiring, short circuits, internal A/D converter faults, underrange, overrange, and user-configurable high/low process alarms. Fault events illuminate front-panel status LEDs and transmit detailed diagnostic reports across the Genius bus, with individual diagnostic reporting configurable on a circuit-by-circuit basis.

Technical Specifications

Installation and Mechanical Construction

The complete IC660BBA101 block assembly consists of two separable sub-components: an electronic processing unit and a terminal block base. Field sensor wiring terminates directly on the terminal assembly, enabling maintenance personnel to unlatch and replace the electronic assembly without disconnecting field wiring harnesses or disrupting adjacent I/O modules on the DIN rail or panel surface.

Frequently Asked Questions

Q: What power source is required to operate the IC660BBA101 module? A: The module operates on a line supply of 115 VAC (93–132 VAC, 47–63 Hz) or 125 VDC (105–145 VDC) with a maximum power dissipation of 7 W.

Q: How does the IC660BBA101 handle field temperature linearization? A: Internal microprocessors automatically perform temperature linearization based on user-configured sensor curves (Platinum, Nickel, Copper, or Linear Resistance), transmitting measurements directly in tenths of degrees Celsius, Fahrenheit, or raw Ohms.

Q: Can fault detection be disabled for unused channels on the IC660BBA101? A: Yes, diagnostic reporting for open wire, overrange, underrange, and limit alarms can be enabled or disabled individually per circuit using a Genius Hand-Held Monitor or PLC programming software.