Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Product Introduction
When a refinery’s Centum VP DCS network drops 12 controller communication sessions mid-run, the root cause almost always traces back to a failed V Net repeater module that can no longer isolate transceiver faults.
Purpose-built for Yokogawa’s Centum VP distributed control system, this module manages all V Net repeater transceivers on the control network. It provides 500V AC isolation between every channel to block ground loop noise, and it automatically isolates faulty transceivers to prevent network-wide broadcast storms.
AIP171
AIP171
AIP171
AIP171
AIP171
Key Technical Specifications
| Parameter | Value |
|---|---|
| Supported Transceivers | Up to 16 (electrical + optical) |
| Power Supply | 24 VDC |
| Max Power Consumption | 20 W |
| Full Scale Accuracy | ±0.02% |
| Channel Isolation Rating | 500 V AC |
| Operating Temperature Range | 0°C to +50°C |
| Non-condensing Humidity Rating | 0% to 95% RH |
| Physical Depth | 152 mm (6.0 in) |
| Form Factor | Compact DIN rail mount |
| Self-Diagnosis Features | Open circuit, short circuit, overrange detection |
| Supported DCS Platforms | Centum VP, Centum CS 3000 |
Field Application & Technical Pitfalls
This part runs three non-negotiable production-critical roles.
First, it acts as the core V Net repeater controller for refinery hydrocracker DCS networks, where a single network fault can disable 30+ control loops at once.
Second, it provides isolated signal transmission for pharmaceutical plant reactor temperature monitoring loops, ensuring FDA-compliant stable data collection across 8 thermocouple channels.
Third, it serves as the fault isolation layer for power plant boiler control DCS networks, automatically isolating a faulty fiber transceiver without taking down the entire control network.
⚠️ DIP Switch Configuration Mismatch Risk: This module uses 8 on-board DIP switches to set the V Net node address. If you set the same address on two AIP171 modules on the same network, you’ll trigger a full V Net collision that locks all controller communication for 10+ minutes.
⚠️ ESD Damage on Transceiver Ports: The 16 SFP transceiver ports on the front of the module have no on-board transient suppression. Touch the SFP pin with a non-grounded cable, and you’ll blow the first stage signal amplifier before you lock the connector.
⚠️ Platform Compatibility Gap: This module only works with Centum VP and CS 3000 systems running firmware R5.03 or newer. Drop it into an older Centum CS 1000 system, and the V Net handshake will fail, locking all network traffic.
I watched a junior DCS tech skip the node address check last quarter. He swapped this module into a pharmaceutical plant DCS rack, accidentally set the same node address as the existing primary repeater, and the entire V Net network went down. The plant lost 2 hours of production, and 3 ongoing reactor batches had to be scrapped, costing the facility an estimated $180k in lost product. That 1-minute configuration oversight forced the operations team to perform a full network reset and re-verify every control loop.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Yokogawa’s official part revision database, run anti-counterfeit validation on the module’s laser-etched serial label, and confirm no prior rework traces on the SFP port solder joints.
- Live Rig Testing: Mount the module in a certified Centum VP test rack, connect 16 test transceivers, and verify full V Net network communication stability across 4 hours of continuous load testing.
- Parameter Testing: Perform 600V AC 60-second dielectric withstand test across all signal channels and chassis ground, confirm every channel reads within ±0.02% accuracy, and log all fault isolation response time data.
- Final QA & Packaging: Seal the fully tested module in a static-shielding anti-static bag, apply a unique QC passed serial label, and pack it in ESD-dissipative foam with a printed hard copy of the full communication stability test report.
Frequently Asked Questions
- Can I hot-swap this module while the V Net network is powered on? Yes, it supports Yokogawa’s hot-swap specification. But you must put the corresponding V Net segment into maintenance mode first — the network will momentarily drop 2 seconds of traffic during insertion if you skip this step.
- What exact Yokogawa DCS systems does this part work with? It is fully compatible with Centum VP and Centum CS 3000 systems running firmware R5.03 or newer. It will not establish stable V Net communication on older Centum CS 1000 systems.
- How long is the standard warranty for this new surplus unit? It carries a full 12-month functional warranty. If it fails within that window under specified operating conditions, we cover all return shipping and bench replacement costs.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine units have the Yokogawa hologram sticker on the side of the PCB, and every SFP port uses gold-plated contact pins. Refurbished clones usually skip the hologram and use tin-plated pins that corrode in high-humidity industrial environments.
- Will this AIP171 directly replace an older AIP170 V Net repeater module? No. The AIP170 only supports 8 transceivers, while this unit doubles that to 16. You will need to reconfigure the V Net network topology in the Centum VP configuration software after swapping.
- What’s the maximum safe continuous operating temperature at full 16-transceiver load? It will hold ±0.02% accuracy up to 50°C, though your mileage may vary if the rack cooling airflow drops below 15 CFM and internal component temperatures spike 15°C above ambient.
