Description
Product Introduction
The ABB AX670 is an 8-channel analog output module built for legacy Advant OCS and S600 I/O architectures. It translates digital commands from the controller into precise current or voltage signals to drive control valves, variable frequency drives, and positioners across heavy industrial processing plants.
Engineers choose the AX670 because it delivers high channel density while maintaining strict galvanic isolation per channel group. Unlike cheaper general-purpose I/O cards, this unit includes onboard diagnostics that flag loop open-circuits and channel faults directly to the controller error log, saving hours of manual multimeter troubleshooting during process disruptions.
Key Technical Specifications
| Parameter | Specification |
| Part Number | 3BSE000720R1 |
| Output Channels | 8 isolated channels |
| Signal Ranges | 0 to 20 mA, 4 to 20 mA, 0 to 10 V DC |
| Resolution | 12-bit (0.025% of full scale) |
| Accuracy | ±0.1% at 25°C ambient |
| Load Resistance (Current) | Maximum 500 Ω at 20 mA |
| Module Power Supply | 24 V DC (19.2 to 30 V DC range) |
| Isolation | 500 V AC channel-to-bus galvanic isolation |
| Power Consumption | Approx. 4.5 W internal consumption |
| Diagnostics | Open loop detection, power failure monitoring |
Application Scenarios & The “Trench” Experience
A chemical plant in Texas called us at 1:30 AM after a main steam control valve pinned wide open. The culprit was a burned-out channel on an aging analog output card that had lost its 4-20mA current loop driver. The plant was losing roughly $18,000 every hour the unit stayed down. Swapping the faulty board with a pre-tested AX670 module restored loop communication and brought the boiler feed control back online in under 20 minutes.
- Pulp & Paper – Control Valve Positioning – Provides steady 4-20mA signals to pneumatic valve positioners on stock line feeds.
- Power Generation – Turbine Governor Control – Regulates speed setpoints on VFDs controlling boiler draft fans.
- Water Treatment – Chemical Dosing Pumps – Adjusts stroke speeds on dosing pumps based on real-time pH feedback loops.
- Petrochemical Refining – Distillation Column Heat Exchangers – Drives steam modulating valves with sub-milliamperage precision.
- AX670
- AX670
Transparency SOP: Quality Assurance & Testing
We do not just ship boxes; we test them on actual ABB racks before they leave our warehouse floor. Every AX670 module undergoes a five-stage bench validation process:
- Inbound Visual & Anti-Counterfeit Inspection: We inspect casing integrity, verify original ABB serial labels, and examine terminal connectors under magnification for trace corrosion or pin bending.
- Live Rack Power-On Test: The card is installed in a live ABB rack to verify bus backplane initialization, hardware handshakes, and power rail stability.
- 8-Channel Loop Calibration Check: Using calibrated Fluke process meters, we drive each channel from 0% to 100% (4mA, 12mA, 20mA / 0V, 5V, 10V) to confirm output drift remains strictly within ±0.1% tolerance.
- Fault Simulation & Load Testing: We intentionally open-circuit each loop to verify the card correctly reports wire-break diagnostic flags to the host controller.
- ESD Clearance & Sealed Packaging: The module is cleaned with isopropyl electronics wash, baked in a low-temp desiccation chamber if needed, and sealed in anti-static ESD bags with fresh desiccant.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Watch Out for External 24V Loop Power Connections: The requires an external 24 V DC field supply for output drive circuits. If you land the module on the rack without connecting external field power to the terminal unit, the status LED might light up green from backplane power, but your field loops will output absolute zero milliamps.
❗ DIP Switch Settings vs. Software Config Mismatches: Before slating this card into service, verify the hardware jumper or DIP switch positions on the side PCB. If the module is set for 0-10V via hardware but your control program expects 4-20mA, you risk sending full voltage into a current-loop device, potentially frying the field positioner input board.
⚠️ Terminal Base Seat Alignment: Don’t force the module onto the terminal block base. The backplane pins are delicate. Alignment guide tabs wear down on older racks. If the card doesn’t seat smoothly with light thumb pressure, pull it back and check for bent pins inside the female connector socket.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the ABB module hot-swappable?
A: No. Do not pull this module while the backplane power is live unless your specific baseplate explicitly supports hot-configuration under run. Pulling this card live on a standard base plate can spike the backplane data lines and drop adjacent I/O modules on the same segment.
Q: Can I replace an older revision with the 3BSE000720R1 hardware rev?
A: Yes. The 3BSE000720R1 is backward-compatible with earlier hardware revisions of the . However, always double-check your controller firmware version in the system software to ensure the hardware definition file matches.
Q: Are these units brand new or surplus?
A: Since ABB discontinued this specific line, true factory-new units from current production do not exist. Our inventory consists of unused “New Surplus” units (original packaging, never installed) and fully reconditioned/tested field units sourced from plant upgrades.
Q: What warranty comes with this module?
A: We back every module with a 12-month full replacement warranty. If a channel drifts out of spec or fails within 365 days of installation, we ship a replacement unit immediately.
Q: Why is your pricing lower than buying through traditional OEM channels?
A: Traditional OEM channels charge steep markup and extended lead times for legacy or mature components. We source surplus units directly from industrial plant modernization projects and global inventory buybacks, passing the savings down without compromising on bench testing quality.
Start Chat
