Yokogawa AAI143-H50/K4A00 CENTUM Analog Input Module
Manufacturer: Yokogawa
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Part Number: AAI143-H50 S1
Condition：New with Original Package
Product Type: Analog Input Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAI143-H50/K4A00 AAI143 Isolated Analog Input Module
Configured for 16-channel analog current signal conversion in CENTUM VP and CENTUM CS 3000 systems, the Yokogawa AAI143-H50/K4A00 (AAI143 Analog Input Module) provides direct physical/electrical execution. The hardware conditions standard 4-20 mA DC field transmitter loops and executes 10 ms fast data updating directly across the FIO backplane bus. Additionally, superimposing digital HART signals onto the analog process variable enables direct pass-through of field device diagnostics and parameters to the host architecture.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H50/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg (Shipping: 2-3 kg) |
| Dimensions | Standard FIO Module Slot Size |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | Max. 230 mA at 5 VDC, 540 mA at 24 VDC |
| Input Channels | 16 channels, isolated |
| Input Signal Range | 4-20 mA DC (Supports 2-wire / 4-wire) |
| Input Isolation | 1500 VAC for 1 minute (Field-to-System) |
| Measurement Accuracy | +/-16 uA |
| Data Update Period | 10 ms |
| Temperature Drift | +/-16 uA / 10 deg C |
| Transmitter Loop Power | >= 19.0 VDC at 20 mA (Current Limit: ~25 mA) |
| HART Communication | Supported (HART Protocol) |
| Cable Adapter Interface | /K4A00 (KS Cable Interface Adapter Model ATK4A-00) |
HART Protocol & Channel Isolation Performance
The module integrates 4-20 mA HART loop protocol capability across all 16 isolated channels, allowing continuous bi-directional digital data transfer between smart field transmitters and the DCS controller. Electrical channel-to-channel isolation and field-to-system galvanic isolation protect the backplane from ground loops, potential surges, and high-voltage common-mode interference up to 1500 VAC. Furthermore, internal current-limiting circuits maintain continuous transmitter supply power above 19.0 VDC at 20 mA while enforcing dynamic loop overload protection.
Frequently Asked Questions
Q: How does the /K4A00 option code affect physical signal termination?
A: The /K4A00 option code installs an onboard KS Cable Interface Adapter (Model ATK4A-00). Consequently, technicians route field wiring via standard multi-core KS cables directly to an external AEA4D terminal board, which simplifies rack cabling and prevents direct strain on module connectors.
Q: What happens to the input resistance during module power loss?
A: When powered on, the module maintains an input resistance ranging from 270 ohm at 20 mA to 350 ohm at 4 mA. However, if system 24 VDC power cuts off, the internal solid-state switching transitions to an unpowered state with an input resistance of 500 kohm or greater, thereby preventing loop load collapses on powered 4-wire loops.
Q: Can engineers install the module in dual-redundant configurations?
A: Yes. Dual AAI143 modules mount into adjacent pairs on the FIO base unit. The system bus controller manages automated channel mirroring and failover control without interrupting the 10 ms process variable scan period.
Field Installation Guidelines
When installing the module into an active CENTUM FIO node, slide the unit carefully into the designated rack slot until the backplane connector fully seats. Tighten the top and bottom retention screws to 0.5 Nm of torque to guarantee proper chassis ground grounding path.
Before attaching the KS cable via the ATK4A-00 interface adapter, verify that field wiring shields land firmly on the terminal cabinet ground bar rather than floating near power distribution runs. Maintain at least 100 mm separation between field signal cables and high-voltage power conduits to limit electromagnetic interference. Finally, check that loop voltage stays within operating bounds under full 20 mA current drive before bringing field loops online.