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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE Fanuc / GE Intelligent Platforms |
| Current Product Brand | Emerson Automation |
| Series | Genius I/O |
| Part Number | IC660BBA026 |
| Product Type | 24/48 V DC current-source analog input block |
| Number of Inputs | 6 |
| Input Type | Isolated 4–20 mA current inputs |
| Input Range | 4–20 mA |
| Overrange Capacity | 0–25 mA |
| Block Supply | 18–56 V DC |
| Nominal Supply | 24/48 V DC |
| Maximum Block Current | 700 mA |
| Loop Excitation | 24 V DC |
| Short-Circuit Excitation Current | Less than 75 mA |
| Input Impedance | 100 Ω ±5% |
| Maximum Loop Impedance | 1,000 Ω at 0–20 mA; 800 Ω at 20–25 mA |
| Input Accuracy | 0.1% of full-scale reading at 25 °C |
| Input Resolution | 1 µA |
| Conversion Time | 16.6–400 ms, user selectable |
| Diagnostics | Underrange, overrange, high alarm, low alarm, open wire, internal fault |
| Channel Isolation | 1,500 V RMS |
| Block-to-Block Isolation | 1,500 V for 1 minute |
| Heat Dissipation | 12 W maximum |
| Operating Temperature | 0–60 °C |
| Storage Temperature | −40 to +100 °C |
| Humidity | 5–95%, non-condensing |
| Dimensions | Approximately 22.44 × 9.05 × 11.23 cm |
| Weight | Approximately 1.8 kg |
| Network | Genius serial bus |
| Configuration Tool | Phase B Hand-held Monitor, IC66HHM501H version 4.5 or later |
| Compatible BSM | IC66BSM021 for 24/48 V DC bus switching |
| Terminal Assembly | IC660TBA026 |
| Electronics Assembly | IC660EBA026 |
| Condition | Must be stated as New Original, New Surplus, or Refurbished (tested) |
The GE Fanuc IC660BBA026 is a Genius I/O current-source analog input block with six isolated 4–20 mA inputs. Each channel provides loop excitation, software-configurable scaling, programmable conversion time, and fault diagnostics.
The block requires 24/48 V DC operating power and accepts 18–56 V DC. The official technical data specifies 0.1% full-scale accuracy at 25 °C, 1 µA resolution, 1,500 V RMS channel isolation, and selectable conversion times from 16.6 to 400 ms.
Product Introduction
GE Fanuc IC660BBA026 is a six-channel Genius I/O current-source analog input block for 4–20 mA transmitters. It supplies 24 V DC loop excitation to compatible current-source devices and sends scaled process values to a Genius bus controller.
The module supports open-wire, overrange, underrange, high-alarm, and low-alarm diagnostics. Verify the revision, terminal assembly, Genius bus controller, device number, baud rate, scaling, and 24/48 V DC power wiring before replacement.
IC660BBA026
IC660BBA026
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Unit OK LED is off | Missing block power, blown fuse, or failed electronics assembly | ✅ High | Measure 18–56 V DC at the block power terminals and inspect the ground connection | Verify power and grounding before replacing the block |
| I/O Enabled LED is off | No CPU communication, bus fault, or block not configured | ✅ High | Check Genius serial bus wiring, device number, and controller diagnostics | Correct bus configuration before replacing the input block |
| One channel reads zero | Open transmitter loop, broken wire, or inactive circuit | ✅ High | Measure loop current and transmitter excitation at the affected EXC/IN/COM terminals | Repair field wiring or transmitter power first |
| All channels read zero | Missing block power, incorrect common wiring, or lost Genius communication | ✅ High | Verify supply, bus status, and several channel currents independently | Diagnose shared power and bus circuits before replacement |
| Input reads above 20 mA | Overrange signal, transmitter fault, or incorrect scaling | ✅ High | Measure loop current with a calibrated meter and compare with the configured range | Correct transmitter or scaling; do not replace the block without confirming current |
| Open-wire alarm appears | Current below approximately 2 mA or broken loop | ✅ High | Measure loop continuity and current at the field terminals | Repair the loop and verify transmitter excitation |
| High or low alarm is active | Configured alarm threshold exceeded | ✅ High | Read the channel’s configured alarm limits and compare with measured current | Determine whether the process value or threshold is the cause |
| Noisy analog value | Poor shield termination, ground loop, EMI, or unstable transmitter | ✅ Possible | Trend the channel and inspect shield termination at the designated GND terminals | Correct shielding and grounding before replacing the block |
| Values are slow to update | Long conversion time selected | ❌ Low | Check the configured conversion time using the Hand-held Monitor or host software | Select an appropriate conversion time; slower settings improve noise rejection |
| Values have poor resolution | Short conversion time or incorrect scaling | ✅ Possible | Review conversion time and scaling configuration | Use the required conversion time and engineering-unit scaling |
| Bus communication fails | Wrong baud rate, device-number conflict, termination problem, or broken serial cable | ✅ High | Check Genius bus terminals 1–4, baud rate, address, and termination resistor | Correct the serial bus before replacing the analog block |
| Replacement reports mismatch | Wrong revision, terminal assembly, or electronics assembly | ✅ High | Compare the block suffix, housing, keying, and IC660TBA026 terminal assembly | Match the replacement revision and terminal hardware |
| Block fault persists after reset | Internal electronics fault or configuration protection | ✅ High | Read the fault with the Phase B Hand-held Monitor and record the diagnostic code | Replace or repair the electronics assembly after external causes are excluded |
| BSM does not switch | Wrong BSM version, incorrect wiring, or BSM configuration | ⚠️ Possible | Check terminals 8–9 and verify the IC66BSM021 24/48 V DC module | Use the specified BSM version and wiring arrangement |
Important: This block provides loop excitation and contains hazardous field wiring when external transmitters are powered. Isolate the field circuits before removing the electronics assembly. The manufacturer documentation warns that connector pins can remain energized when field power is applied.
Frequently Asked Questions (FAQ)
What is GE Fanuc IC660BBA026?
It is a six-channel 24/48 V DC current-source analog input block in the Genius I/O family. It interfaces 4–20 mA transmitters, supplies loop excitation, and communicates measured values over the Genius serial bus.
Does IC660BBA026 provide transmitter power?
Yes. Each input provides approximately 24 V DC loop excitation and can supply up to 25 mA under the documented conditions. Check total loop loading and cable resistance before connecting multiple transmitters.
What is the difference between IC660BBA026 and IC660BBA106?
is the 24/48 V DC version. IC660BBA106 is the 115 V AC/125 V DC version. The input functions are similar, but the block power supply requirements are different; they are not direct power-compatible substitutes.
What resolution does the module provide?
The specified input resolution is 1 µA. The conversion time is user selectable from 16.6 to 400 ms, and longer conversion times provide stronger noise rejection and higher effective resolution under the documented operating conditions.
Which configuration tool is required?
The block requires a Phase B Hand-held Monitor, model IC66*HHM501H, version 4.5 or later, for configuration. Device number, baud rate, scaling, conversion time, alarm limits, and fault reporting can be configured through the monitor or host system.
Can I replace only the electronics assembly?
The documentation identifies a separate IC660EBA026 electronics assembly and IC660TBA026 terminal assembly. This can simplify replacement, but confirm the housing revision, keying, terminal condition, and field-power state before removing the electronics assembly.
Is the module compatible with every Genius bus controller?
No. Compatibility depends on the controller family and revision. The documentation identifies support for specified IC660, IC697, and related Genius controllers, with some older controller combinations excluded. Check the exact CPU, bus controller, software revision, and baud rate before installation.
Is the unit new or refurbished?
The part number does not establish condition or revision. State the actual status as New Original, New Surplus, or Refurbished (tested). A proper test record should include all six 4–20 mA channels, loop excitation, scaling, conversion time, Genius bus communication, alarm diagnostics, open-wire detection, LEDs, and insulation checks.
