Description
GE Fanuc IC660BBA026 | 24/48 VDC 4–20 mA Block
Dynamic Product Introduction
A 4–20 mA transmitter can be electrically healthy and still deliver bad process data if the input channel, loop wiring, or scaling is wrong. The GE Fanuc IC660BBA026 is a six-channel Genius I/O current-source analog input block designed to acquire current-loop signals from field instrumentation and report those values to a compatible controller over the Genius bus.
Each input circuit provides a 24 VDC loop supply and is isolated from the other input circuits. The block supports configurable scaling, alarm limits, and selectable conversion times. At a 200 ms conversion time, the documented input resolution is 1 µA; faster conversion settings trade some resolution for response speed. This makes the IC660BBA026 useful for distributed measurement applications involving flow, pressure, level, and other current-transmitter signals.
This is a legacy Genius I/O component, so replacement planning should include more than a part-number match. The installed bus architecture, block configuration, revision, terminal assembly, and channel scaling all need to be considered. For a plant extending the life of a GE Fanuc control system, a tested IC660BBA026 can support maintenance continuity—but only when the incoming unit is confirmed against the actual field configuration.
IC660BBA026
Key Technical Specifications
- Catalog Number: IC660BBA026
- Series: GE Fanuc Genius I/O
- Function: Current-source analog input
- Number of Inputs: 6
- Input Signal: 4–20 mA nominal
- Configurable Input Range: 0–25 mA
- Input Resolution: 1 µA at 200 ms conversion time
- Input Accuracy: 0.1% of full-scale reading
- Input Conversion Time: Selectable from approximately 16.6 ms to 400 ms
- Loop Supply: 24 VDC per input circuit, up to 25 mA
- Nominal Block Supply: 24/48 VDC
- Block Supply Range: 18–56 VDC
- Maximum Heat Dissipation: 12 W
- Isolation: 1,500 V block-to-block; individual input circuits isolated from one another
- Diagnostics: High/low alarm limits, input fault reporting
- Configuration Interface: Genius Hand-held Monitor (HHM)
- Network: Genius I/O
- Approximate Dimensions: 8.83 × 3.50 × 3.94 in.
- Approximate Weight: 4 lb. (1.8 kg)
Specifications are drawn from available Genius I/O documentation and supplier technical records. Confirm the applicable hardware revision and manual before using these values as formal acceptance limits.
Global Sourcing & Live-Test SOP
A legacy analog input block should be evaluated by channel performance—not simply by whether its status LEDs illuminate.
Inbound Verification
- Photograph the complete IC660BBA026 nameplate and record its hardware revision.
- Confirm the shipment is the complete block, not an IC660TBA026 terminal assembly or IC660EBA026 electronics assembly alone.
- Inspect the enclosure, terminal connections, and mounting surfaces for cracking, corrosion, or evidence of overheating.
- Check supplier documentation and available serial/lot traceability.
- Confirm the unit is not an IC660BBA106 or another similar-looking Genius block with a different supply class.
- Review the installed system’s Genius bus configuration and terminal arrangement before approving it as a replacement.
Functional Test
- Apply a controlled DC supply within the specified 18–56 VDC operating range.
- Confirm the block powers up and reports normal status.
- Establish Genius bus communication using a compatible controller or test interface.
- Connect calibrated current-loop simulators to all six input channels.
- Verify representative input points, including 4 mA, 12 mA, and 20 mA.
- Where supported by the test setup, check additional points across the configured 0–25 mA range.
- Verify scaling and engineering-unit conversion against the test current.
- Exercise high/low alarm settings and confirm fault reporting.
- Record measured values, supply voltage, hardware revision, and channel-level test results.
Burn-In & Final Preparation
- Run an extended powered test under controlled conditions.
- Monitor block status and communication stability.
- Check for intermittent channel drift or input faults.
- Record the configuration used during testing.
- Package the block in ESD-safe material with terminal protection.
- Identify the actual sales condition: used, refurbished, surplus, or factory sealed.
A 24-hour heat run may be used as a supplier-defined screening procedure. It should not be described as an OEM-mandated test unless the applicable documentation specifies it.
Field Engineer’s Pitfall Guide
❗ Do Not Confuse the Input Block With an Output Block
The is an analog input block. It reads current-loop signals; it does not generate the 4–20 mA command used to position a valve or control a drive. Confirm the signal direction before ordering—particularly when comparing it with IC660BBA025, the related six-channel current-source analog output block.
❗ Conversion Time Affects Resolution
The block’s selectable conversion time is not just a configuration detail. The documented 1 µA resolution applies at a 200 ms conversion time; faster conversion settings can reduce resolution. When replacing a failed unit, compare the original conversion-time and scaling configuration instead of assuming the default setup will reproduce the same process readings.
❗ Verify the Supply Class and Terminal Assembly
is the 24/48 VDC block. IC660BBA106 is the related 115 VAC/125 VDC version. Similar catalog numbers do not guarantee equivalent power requirements or installation compatibility. Confirm the complete part number and terminal assembly before installing a replacement.
Intent-Driven FAQ
What does the GE Fanuc do?
It is a six-channel Genius I/O analog current-input block. It acquires current-loop signals—typically 4–20 mA—from field transmitters and communicates the values to a compatible controller.
Does the provide loop power?
Yes. Each input circuit provides a 24 VDC loop supply capable of generating up to 25 mA. Verify transmitter wiring and loop requirements against the applicable block documentation before connecting field devices.
What is the input resolution?
The documented resolution is 1 µA at a 200 ms conversion time. Since conversion time is selectable, confirm the configured value when comparing replacement performance.
Can I hot-swap the ?
Do not assume hot-swap safety. Follow the site’s approved Genius I/O maintenance procedure and evaluate the effect of removing the block on the controller, bus, field loops, and process. Isolate field wiring and power where required by the installation procedure.
Is the still an OEM-current product?
The is a legacy GE Fanuc Genius I/O product. Buyers should verify availability, hardware revision, test status, and warranty terms with the seller rather than assume new OEM production or support.
Is IC660BBA106 a direct replacement?
Not automatically. IC660BBA106 is the related 115 VAC/125 VDC current-source analog input block, whereas is the 24/48 VDC version. The supply class and installed configuration must be checked before considering substitution.
What should I verify before purchasing a refurbished ?
Confirm the exact catalog number, hardware revision, complete-block status, six-channel operation, Genius bus compatibility, terminal condition, and documented test results. Also obtain the seller’s warranty duration, return terms, and exclusions in writing.
