Description
Product Overview
The Yokogawa AAI143-H50K4A00 is a 16-channel isolated analog input module designed for industrial process-control systems. It receives standardized 4–20 mA signals from field instruments and transfers the measured values into the control system for monitoring, alarming, and process control. The HART-enabled version also supports digital communication with compatible smart transmitters, allowing supported instrument information to be accessed alongside the analog process variable. This combination is useful in applications involving pressure, flow, level, temperature transmitters with current outputs, and other process measurements.
The model suffix provides important information for selecting the correct execution. The H identifies HART communication, 5 indicates the version without explosion protection, and /K4A00 specifies the KS cable interface adapter, model ATK4A-00, for connection to an AEA4D terminal board. The complete ordering code is commonly written as AAI143-H50/K4A00. This notation should be compared with the installed module label because the cable interface and explosion-protection designation affect the suitability of the assembly for a particular cabinet and field installation.
For maintenance and procurement teams, channel isolation and signal accuracy matter when troubleshooting unstable measurements or replacing a failed input module. The published specifications include a 10 ms data-update period and an accuracy figure of ±16 µA. The module also supports channel-level configuration for 2-wire or 4-wire transmitters. Before installing a replacement, verify the terminal-board arrangement, field wiring, transmitter power requirements, and control-system revision. HART functions also depend on the relevant system software and communication configuration, so confirm these details before expecting digital instrument access after replacement.
Product Introduction (Non-Templated)
When several transmitter readings become unreliable, the cause may involve the field loop, terminal connections, or analog input hardware. The Yokogawa AAI143-H50K4A00 provides 16 isolated 4–20 mA input channels with HART communication for compatible field devices. Its published data-update period is 10 ms, with a stated accuracy of ±16 µA.
Check the /K4A00 cable-interface option and terminal-board connection before ordering. The correct input module can still be unsuitable if its interface hardware or installed system configuration does not match.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yokogawa |
| Model | AAI143 |
| Full ordering code | AAI143-H50/K4A00 |
| Product type | Isolated analog input module |
| Number of channels | 16 |
| Input signal | 4–20 mA DC |
| Maximum allowable input current | 24 mA |
| Channel isolation | Isolated inputs |
| Accuracy | ±16 µA, as specified in published module data |
| Data-update period | 10 ms |
| Input resistance, powered | Approximately 270 Ω at 20 mA to 350 Ω at 4 mA |
| Input resistance, unpowered | 500 kΩ or higher |
| Transmitter connection | 2-wire or 4-wire, configurable per channel |
| Transmitter supply | At least 19.0 V at 20 mA; no more than 25.5 V at 0 mA |
| Transmitter supply current limit | 25 mA |
| Input-to-system withstand voltage | 1,500 VAC for 1 minute |
| HART communication | Supported |
| Explosion protection designation | Suffix 5: no explosion protection |
| Cable interface option | /K4A00, KS adapter ATK4A-00 |
| Associated terminal board | AEA4D |
| Maximum power consumption | 230 mA at 5 VDC; 540 mA at 24 VDC |
| Operating temperature | Verify the applicable standard or G3-rated execution |
| Condition | Confirm for the supplied unit |
Specifications are based on published AAI143 family documentation and product references. Confirm the exact revision and applicable environmental options before using the table for engineering approval.
AAI143-H50K4A00
Related Products
These Yokogawa products are relevant to analog signal acquisition and FIO system maintenance, but they are not automatically interchangeable.
- AAI143-H50/K4A00 — The normalized ordering-code format for the target configuration. Use this form when comparing documentation and nameplate markings.
- AAI143-H00/ — An earlier listed HART analog input configuration. Verify the exact revision and replacement guidance before substituting it.
- AAI143-H50/A4S00 — A variant with a pressure-clamp terminal block, model ATA4S-00, instead of the KS cable interface option. Terminal hardware differs.
- AAI143-H50/A4D00 — A variant with a dual pressure-clamp terminal block, model ATA4D-00. Confirm the required terminal arrangement before considering it.
- AAI143-H50/A4S10 — A pressure-clamp terminal-block variant with a surge absorber. Check the installation design and option code.
- AAI543 — Yokogawa’s 16-channel isolated 4–20 mA analog output module family. It serves an output function rather than the input function of .
- ATK4A-00 — KS cable interface adapter specified by the
/option for connection to an AEA4D terminal board. Confirm whether the adapter is supplied with the module or required separately.
Frequently Asked Questions
1. What does the Yokogawa -H50K4A00 do?
It acquires 16 isolated 4–20 mA analog input signals and supports HART digital communication with compatible smart transmitters. The / option identifies the KS cable interface adapter used for the specified terminal-board connection.
2. Can I hot-swap the -H50K4A00 while the DCS is running?
Do not assume that live replacement is permitted. Removing the module may interrupt process measurements or affect control functions. Check the applicable Yokogawa maintenance procedure, system redundancy arrangement, and site isolation requirements before removal. Verify affected channel behavior and alarms after replacement.
3. Does this module support firmware v3.1?
A general firmware version designation such as v3.1 cannot be confirmed as compatible with this module from the part number alone. Verify the installed CENTUM/FIO system release and relevant HART communication package. Manufacturer documentation identifies software and remote-node hardware requirements for HART functionality, so system revision checks are important.
4. Can I replace -H50K4A00 with a version that has a different terminal option?
Not without checking the physical interface and wiring design. / uses the KS cable interface adapter for an AEA4D terminal board. Other option codes identify pressure-clamp terminal blocks or other connection arrangements. A similar base model does not guarantee that the termination hardware matches.
5. Does the module support 2-wire and 4-wire transmitters?
Published specifications indicate that 2-wire and 4-wire transmitter connections can be selected per channel using the appropriate setting. Confirm the wiring method, transmitter supply requirements, and channel configuration before connecting field instruments.
6. How do I verify whether a supplied module is genuine and in acceptable condition?
Request clear photographs of the nameplate, full model code, revision markings, and interface hardware. Obtain written confirmation of the condition—new, unused surplus, used, or refurbished—and ask for test results covering analog input channels and HART communication. A visual inspection alone does not verify measurement accuracy or channel isolation.
7. What should be checked after installation?
Confirm the module’s identity, terminal-board connection, channel wiring, transmitter power, and 2-wire or 4-wire configuration. Verify representative 4–20 mA readings against a calibrated source or known field signal, check engineering-unit scaling, and test HART communication where required. Complete the site’s commissioning checks before returning the affected process loops to service.
Procurement recommendation: Specifyawa /, 16-channel isolated 4–20 mA HART analog input module, with KS cable interface adapter ATK4A-00. Confirm the installed terminal board, system software revision, explosion-protection requirements, and the condition of the offered unit before purchase.
