Yokogawa AAI143-S50/A4S00 16-Channel Isolated Analog Input Module
Product Summary
Yokogawa AAI143-S50/A4S00 is a 16-channel isolated 4-20 mA input module for the CENTUM VP FIO system, supplied with the ATA4S-00 pressure-clamp terminal block. It receives field current from transmitters and converts each channel into input data for the control system.
On Yokogawa AAI143-S50/A4S00, each channel is configured for either a two-wire transmitter powered from the module or a four-wire source with external power. The selected mode determines whether the terminal path supplies loop voltage or only measures the incoming current.
The isolated channels of Yokogawa AAI143-S50/A4S00 separate field inputs from the system side, while the ATA4S-00 block forms the direct wiring interface for all sixteen loops. Channel labels, conductor position and pressure-clamp terminals therefore define the physical route from each transmitter to its assigned input.
Technical Details
| Brand | Yokogawa |
|---|---|
| Model | AAI143-S50/A4S00 |
| Product Name | 16-Channel Isolated Analog Input Module |
| Country | Japan (manufacturer) |
| Input Channels | 16, isolated |
| Input Signal | 4 to 20 mA |
| Allowable Input Current | 24 mA |
| Input Resistance - Power On | 270 to 350 ohms |
| Input Resistance - Power Off | 500 kilohms or larger |
| Accuracy | ±16 microampere |
| Data Update Period | 10 ms |
| Transmitter Power | 19.0 V or higher at 20 mA |
| Withstanding Voltage | 1500 V AC for 1 minute, input to system |
| Net Weight | Approx. 0.30 kg |
| Terminal Option | ATA4S-00 pressure-clamp terminal block |
Isolated Current Input Architecture
AAI143-S50/A4S00 separates the field input group from the control system and combines current measurement with selectable transmitter powering.
Set two-wire or four-wire mode
Match the setting pin to the actual transmitter circuit on every AAI143-S50/A4S00 channel. A powered two-wire loop and an externally powered four-wire source do not use the same arrangement.
Record the mode on the loop sheet so a later replacement does not restore the wrong transmitter-power condition.
Use isolation within its limits
The documented 1500 V AC withstand applies between input and system under the stated connection conditions. It does not turn the sixteen channels into individually isolated circuits.
Keep barriers, cable choice and grounding consistent with the installation design, especially where intrinsic-safety interfaces are involved.
Verify the current path quantitatively
Inject known 4, 12 and 20 mA values and compare engineering data without changing scaling prematurely. This separates field-current error from software conversion.
Check the allowable current and module input resistance when a calibrator cannot drive the expected value.
Pressure-Clamp Field Termination
ATA4S-00 is part of AAI143-S50/A4S00, so conductor condition and terminal practice directly affect commissioning quality.
Prepare conductors consistently
Strip and insert each conductor to the terminal-block specification, keep ferrules consistent with site practice and avoid trapping insulation in the clamp.
A visually seated wire can still be open under light tension; use a controlled pull check and continuity test.
Keep channel labels with the block
Transfer channel identification before removing the old ATA4S-00. The similar appearance of adjacent current loops makes late reconstruction error-prone.
Photograph the block and record jumper or shield details before any conductor is moved.
Test after mechanical work
After tightening or replacing the pressure-clamp block, verify loop power, current and controller value on every disturbed channel.
Do not accept a module solely because its diagnostics are clear; the terminal block can remain miswired without an electronics alarm.
Customer Questions
01Why does a two-wire transmitter stay unpowered on AAI143-S50/A4S00?+
For AAI143-S50/A4S00, check the channel setting pin, ATA4S-00 terminal assignment, loop polarity and available transmitter voltage before replacing the input module.
02What can cause one AAI143-S50/A4S00 channel to read zero after terminal work?+
AAI143-S50/A4S00 zero reading after terminal work often points to an incompletely clamped conductor, wrong channel position, open loop or lost transmitter power at ATA4S-00.
03Are all AAI143-S50/A4S00 channels isolated from one another?+
No. AAI143-S50/A4S00 provides isolation between the input side and the system; its order description does not claim individual channel-to-channel isolation.
04How should AAI143-S50/A4S00 accuracy be checked?+
Test AAI143-S50/A4S00 with a traceable current source at several points, compare raw and engineering values, and keep transmitter and controller filtering out of the module-only result.
05Can AAI143-S50/A4S00 be ordered as a bare AAI143 without review?+
No. AAI143-S50/A4S00 includes ATA4S-00 pressure-clamp termination, so a bare module or KS-adapter version is a different supplied configuration.
06What should be documented for an AAI143-S50/A4S00 replacement?+
For AAI143-S50/A4S00, document two-wire/four-wire settings, terminal labels, quantity, style/nameplate, barrier details, destination and required inspection records.
Obsolete Parts Support
Moore Automation
https://www.mvme.cn
Moore Automation accepts enquiries for discontinued and hard-to-find industrial automation components. A manufacturer, complete part number, nameplate photograph and system reference give the sourcing team a clearer basis for identifying the requested item without assuming an unconfirmed substitute.
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