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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification |
| Model Code | AAI835-H50 |
| Number of Input Channels | 16 channels, isolated |
| Input Signal | 4 to 20 mA DC |
| HART Communication | Supported (HART protocol pass-through to DCS) |
| Allowable Input Current | 24 mA DC maximum |
| Input Resistance | 250 Ω (Power off: 250 Ω) |
| Withstand Voltage | 1,500 V AC between input terminal and system for 1 minute |
| Data Update Period | 10 ms |
| Transmitter Power Supply | Internal 24 V DC loop power (2-wire transmitter support) |
| Current Consumption | 230 mA max (5 V DC backplane), 450 mA max (24 V DC supply) |
| Mounting | Nested in Field Control Unit (FCU) or node unit |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Yokogawa AAI835-H50 serves as a 16-channel isolated analog input module designed for Centum DCS networks, acquiring critical 4-20 mA process variables alongside digital HART diagnostics from field transmitters.
Maintaining a factory-sealed AAI835-H50 in your local safety stock eliminates the catastrophic Total Cost of Ownership (TCO) risks associated with process downtime. While second-hand or repaired modules carry hidden capacitor degradation and high infant mortality rates, holding genuine New Surplus stock guarantees full 10 to 15 year operational longevity, preserving loop integrity without risking $50,000 per hour in unbudgeted outage costs.
AAI835-H50
AAI835-H50
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Enforce strict Lock-Out/Tag-Out (LOTO) protocols on the respective field wiring loops.
- Put on an ESD wrist strap connected to cabinet earth ground before handling the module.
- Document terminal block pinouts and photograph DIP switch or jumper positions on the existing unit.
Stage 2: Removal
- Unbolt and carefully pivot the pressure-clamp terminal block or detach the signal cable connector.
- Disengage the top and bottom module retaining latches simultaneously.
- Pull the card straight outward along the guide rails to prevent twisting or bending backplane pins.
Stage 3: Installation (Clone & Seat)
- Verify system address switches match the original module configuration exactly.
- Align the AAI835-H50 module with the card cage guide rails in the targeted node slot.
- Slide the unit inward firmly until the backplane connectors seat completely, then lock the retention latches.
Stage 4: Power-On & Testing
- Reattach the terminal block or interface cable securement screws.
- Confirm 24 V DC bus voltage is within a ±5% operational margin before restoring channel power.
- Observe front panel status LEDs: verify green HRDY/RUN illumination and confirm no red DIAG/FAIL errors occur during handshaking.
Firmware/Software Versions & Upgrade Notes
- Recommended Version: Requires System Software R3.01 or higher for full HART pass-through feature capability within Centum VP environments.
- Compatibility Matrix: Backward compatible with Centum CS 3000 systems running compatible Field Control Station (FCS) software revisions, but verify slot assignment restrictions in legacy engineering stations.
- Upgrade/Downgrade Warning: Changing module revision suffixes without updating system system software definitions can cause communication driver timeouts or drop HART pass-through variables. Always audit control station software compatibility in a staging project before hot-swapping hardware revisions.
Frequently Asked Questions (FAQ)
Q: Why is your New Surplus pricing lower than OEM direct, but higher than refurbished options?
A: Our pricing reflects the market cost of sourcing genuine, unused global inventory. Refurbished parts are cheap because they carry high failure risks from aged internal components. Our New Surplus inventory delivers 100% original OEM build quality at a fraction of factory list price.
Q: Is this AAI835-H50 module truly unused?
A: Yes. Every unit is brand-new, stored in anti-static OEM packaging, and has zero wear on backplane edge connectors or solder points. Packaging is opened solely for visual inspection and anti-counterfeit verification.
Q: Can I hot-swap the AAI835-H50 module while the system is live?
A: Yes, Centum VP node units support hot-swapping of I/O modules. However, you must handle the terminal block carefully to avoid shorting adjacent 24 V DC loop power lines during extraction.
Q: Does this module store channel configuration settings internally?
A: No. Channel parameters, signal ranges, and HART scan rates are downloaded automatically from the Field Control Station (FCS) database upon system startup and handshake.
Q: What warranty coverage comes with this module?
A: We provide a full 1-year replacement warranty on all New Surplus modules, covering complete functional operation under normal operating conditions.
