GE Fanuc IC660BBA020 Genius I/O Analog Block

The IC660BBA020 is a standalone, 24/48 VDC powered analog I/O block belonging to the GE Fanuc Genius I/O system. It features four independent analog input circuits and two independent analog output circuits, providing localized signal conversion and direct Genius Bus communication to host controllers without requiring a local CPU rack.

Signal Processing and Diagnostic Functionality

Each channel on the IC660BBA020 supports software-configurable signal ranges, including 0–10 VDC, ±10 VDC, ±5 VDC, 0–5 VDC, and 4–20 mA (or 1–5 VDC). Analog signals are processed using 12-bit plus sign resolution with a 4 ms update frequency across all points.

The block incorporates advanced diagnostics. Inputs monitor for underrange, overrange, open wire, and high/low alarms, while outputs provide underrange and overrange detection. An adjustable input filter ranging from none up to 1024 ms can be set independently per channel to smooth out noisy process signals.

Hardware Architecture and Field Connections

The complete IC660BBA020 block assembly consists of two separable parts: an electronic assembly (IC660EBA020) containing the processing board, and a terminal assembly (IC660TSA020) housing field wiring terminals and configuration memory. This modular design permits the electronics assembly to be unplugged and serviced without disconnecting field wiring or losing stored configuration settings.

Power to the unit is supplied via Terminals 6 and 7 within an operating voltage window of 18 to 56 VDC. The unit can be monitored or configured locally using a handheld monitor such as the IC66*HHM500 connected to the serial bus terminals.

Technical Parameters

Installation Guidelines

The IC660BBA020 is an open-type industrial device that must be mounted inside a protective, clean enclosure free from conductive contaminants. Bus lines must be landed on Terminals 1 through 4 using recommended shielded twisted-pair cabling. DC power connections must be attached to Terminal 6 (DC+) and Terminal 7 (DC-). Ground connections should be properly wired to designated ground terminals (Terminals 5, 12, 20, and 28) to ensure proper shielding and 1500 V block-to-block isolation.

Frequently Asked Questions

Q: What is the main structural difference between the IC660BBA020 and its internal components? A: The complete IC660BBA020 unit consists of the IC660EBA020 electronics assembly and the IC660TSA020 terminal assembly. The terminal assembly remains wired to field devices while the electronics module can be detached for service.

Q: Can the input and output channels be configured for different signal types on the same block? A: Yes, each input and output circuit can be independently software-configured for specific voltage ranges (0–10 V, ±10 V, ±5 V, 0–5 V) or current signals (4–20 mA).