IC660BBA104 GE I/O Block

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Description of IC660BBA104

The GE Fanuc IC660BBA104 is a Genius I/O block designed to interface a programmable controller with up to four 4-20mA analog inputs and two 4-20mA analog outputs. It is powered by a 115VAC/125VDC supply. The module features fully isolated input channels, each providing a 24V loop power supply, simplifying wiring for two-wire transmitters. Advanced software-configurable diagnostics, including open-wire detection and feedback error checking, ensure system reliability without the need for manual calibration.

Six 4-to-20 mA analog circuits: 4 inputs and 2 outputs
Isolated channels
No user calibration required for operation
Software configurable
Advanced diagnostics
Dedicated Bus Switching Module control

Parameter

Power Supply Voltage: 98-132 VAC / 105-145 VDC
Maximum Current: 250mA (AC) / 140mA (DC)
Frequency/Ripple: 47-63 Hz (AC) / 10% max. ripple (DC)
Power Supply Dropout Time: 1 cycle (AC) / 10 ms min. (DC)
Isolation (Block to Block): 1500V for one minute
Isolation (Group to Group): 1500V RMS
BSM Control: Switches one 24/48 VDC BSM (IC66*BSM021)
Number of Inputs: 4
Range: 4mA to 20mA
Overrange Capacity: 0mA to 25mA
Resolution: 1 µA
Conversion Time: 16.6ms to 400ms (user selectable)
Input Impedance: 100 Ohms±5%

FAQ

What does the "Open Wire" diagnostic mean for an input channel?
A: The block provides a 24V power supply on each input channel to power 2-wire transmitters. The "Open Wire" diagnostic indicates that the current flowing in the loop has dropped below 2mA, which is typically caused by a broken or disconnected wire in the loop. This feature allows for quick troubleshooting of field wiring issues.

What is the purpose of the "Output Feedback Error" diagnostic?
A: Each output channel has a dedicated A/D converter that measures the actual output current and compares it to the commanded value. If the difference exceeds 250µA, a "Feedback Error" fault is reported. This can detect wiring errors or a hardware failure in the output circuit. False errors can occur if the "Output Feedback Time" is set too short, and it is recommended to increase this time or disable the test if commanding very low currents (below 1mA).

Do I need an external 24V power supply for my loop-powered sensors when using this block?
A: No. A key feature of this block is that each of the four input channels provides its own internal 24V current loop power supply, capable of sourcing up to a nominal 25mA. This simplifies system design by eliminating the need for separate power supplies for field transmitters, so long as the total loop impedance does not exceed 1000 ohms (at 20mA).