Thermocouple Input Modules | GE Fanuc IC660BBA103

The IC660BBA103 is a GE Fanuc Genius I/O thermocouple input block designed for temperature measurement and millivolt signal conditioning in distributed control systems. Operating on a 115 VAC or 125 VDC nominal supply, this standalone block features 6 input channels arranged in 3 isolated groups of 2 channels each. It integrates signal amplification, filtering, cold junction compensation (CJC), and analog-to-digital conversion directly at the field level, transmitting digitised process data across the serial Genius bus.

Sensor Compatibility and Signal Processing

The IC660BBA103 directly interface with J, K, T, E, B, R, S, and N type thermocouple sensors, as well as low-level voltage signals spanning -25 mV to +150 mV. Internal cold junction compensation covers operating ranges from 0 to 60 deg C with resolution under +/-0.01 deg C, while external CJC extends measurement ranges from -25 to +150 deg C. For voltage measurements, the block achieves typical resolution errors within +/-10 uV and maximum errors within +/-20 uV.

On-Board Diagnostics and System Isolation

The unit includes integrated diagnostic monitoring capable of detecting open wire faults in less than 5.0 seconds, alongside overrange, underrange, high alarm, low alarm, and internal module fault conditions. Galvanic isolation safeguards system integrity, providing 1500 V block-to-block isolation and 300 V group-to-group isolation across its three channel pairs. Front-panel Unit OK and I/O Enabled LEDs provide direct visual status for field troubleshooting and configuration verification via a Hand-Held Monitor.

Frequently Asked Questions

Q: What types of temperature sensors and voltage ranges can be connected to the IC660BBA103?

A: The IC660BBA103 supports thermocouple Types J, K, T, E, B, R, S, and N, as well as direct low-level DC voltage inputs within the range of -25 mV to +150 mV.

Q: How are the input channels on the IC660BBA103 isolated from one another?

A: The 6 input channels are divided into 3 distinct groups of 2 channels each, providing 300 V group-to-group isolation and 1500 V block-to-block isolation to prevent ground loops and protect system electronics.

Q: What diagnostic features are built into the IC660BBA103 thermocouple module?

A: The module automatically detects open wire conditions in less than 5.0 seconds and continuously monitors for overrange, underrange, high/low process alarms, and internal module faults.