Input Block | GE Fanuc IC660BBA021

The IC660BBA021 is a 24/48 VDC powered Resistance Temperature Detector (RTD) input block within the GE Fanuc (Emerson) Genius I/O system. It provides six configurable RTD input channels organized into three isolated groups of two channels. Designed for high-density temperature monitoring, the module converts field sensor readings directly into engineering units (°C, °F, Ohms, or counts) and transmits them across the Genius serial bus to the host CPU.

Signal Conditioning and Linearization

The IC660BBA021 features built-in signal conditioning and onboard linearization routines for standard RTD types, including Platinum (DIN 43760), Nickel (DIN 43760), Copper, and general linear resistance sensors. Temperature values are processed at a high conversion resolution of 0.1 °C.

For direct transducer measurement without conversion curves, the block supports a pure resistance input range of 0 to 5000 Ohms. Channel sampling and input filter times are selectable across 400 ms, 800 ms, or 1600 ms intervals, enabling noise filtering in electrically noisy process environments.

Integrated Diagnostics and System Protection

Extensive diagnostic capabilities are embedded into the module hardware, including shorted input, open wire, wiring error, overrange, underrange, internal fault detection, and configurable process high/low alarms.

To prevent nuisance alarms from filling host system CPU tables during routine maintenance, diagnostic fault reporting can be selectively inhibited per channel. Inhibited diagnostics stop transmission to the host CPU diagnostic buffer while retaining local diagnostic output to a connected Genius Hand-Held Monitor (HHM). Ground-loop suppression and signal integrity are maintained via 1500 V block-to-block isolation and 300 V group-to-group isolation.

Technical Parameters

Installation Guidelines

Mount the IC660BBA021 vertically inside a clean, protective enclosure that ensures adequate clearance for natural convection cooling. Wire external DC power (18–56 VDC window) to the specified block power terminals. Field sensor wiring must follow group isolation requirements, ensuring shield drain wires are terminated at proper ground connection points to maintain the 300 V group-to-group and 1500 V block-to-block isolation levels.

Frequently Asked Questions

Q: Does the IC660BBA021 require field recalibration after routine operation? A: No, the IC660BBA021 is factory-calibrated and does not require periodic recalibration over its operational lifespan.

Q: Can diagnostic alarms be disabled without losing field troubleshooting data? A: Yes, diagnostic messaging for individual channels can be inhibited to prevent fault alerts from being logged in the CPU diagnostic buffer while still displaying active errors on a connected Genius Hand-Held Monitor (HHM).

Q: What is the operating voltage range for powering the IC660BBA021? A: While nominally rated for 24/48 VDC system power, the block accepts an operational DC input range between 18 VDC and 56 VDC.