Overview
Suffix Breakdown & Model Matrix
| Parameter | Specification |
|---|---|
| Base Model | AAI143 |
| Full Model | AAI143-H50/A4S00 |
| Module Type | Analog Input Module |
| Channel Configuration | 16-channel, isolated |
| -H | HART communication |
| -5 | No explosion protection |
| -0 | Basic type |
| /A4S00 | Pressure Clamp Terminal Block, ATA4S-00 |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H50/A4S00 |
| Brand | Yokogawa |
| Weight | Approx. 0.3 kg |
| Power Consumption | 230 mA at 5 VDC; 540 mA at 24 VDC |
| Input Channels | 16 channels, fully isolated |
| Input Signal | 4-20 mA DC |
| Maximum Allowable Input Current | 24 mA |
| HART Communication | Supported |
| Measurement Accuracy | +/- 16 uA |
| Data Update Period | 10 ms |
| Input Resistance, Power ON | 270 ohm at 20 mA to 350 ohm at 4 mA |
| Input Resistance, Power OFF | 500 kohm or greater |
| Transmitter Power Supply | 19.0 V or greater at 20 mA; 25.5 V or less at 0 mA |
| Transmitter Supply Current Limit | 25 mA |
| Transmitter Configuration | Selectable 2-wire or 4-wire per channel |
| Withstanding Voltage | 1500 VAC between input and system for 1 minute |
| Temperature Drift | +/- 16 uA / 10 deg C |
| External Terminal Block | ATA4S-00 Pressure Clamp Terminal Block |
4-20 mA HART Loop Interface
The AAI143-H50/A4S00 receives 4-20 mA DC signals from field transmitters. HART communication uses a digital signal superimposed on the analog current loop. Therefore, the module can acquire the process current while supporting digital transmitter communication.
Each channel provides isolation between the field input and the system. The transmitter connection can use either a 2-wire or 4-wire configuration, selected through the channel setting pins. The module also provides transmitter power within the specified loop conditions.
The specified input resistance changes with loop current when the module is powered. The resistance ranges from 270 ohm at 20 mA to 350 ohm at 4 mA. When power is removed, the input resistance is 500 kohm or greater.
Frequently Asked Questions
Q: How many analog input channels does the AAI143-H50/A4S00 provide?
A: It provides 16 isolated analog input channels, each accepting a 4-20 mA DC signal.
Q: Does the module support HART communication?
A: Yes. The HART digital communication signal can operate on the 4-20 mA analog loop.
Q: Can the transmitter wiring use both 2-wire and 4-wire configurations?
A: Yes. Each channel can be configured for either 2-wire or 4-wire transmitter connection through the setting pins.
Field Installation Guidelines
- Install the module in the specified Yokogawa system hardware and observe the applicable rack and terminal arrangement.
- Confirm the module model and suffix before connecting field wiring.
- Select the required 2-wire or 4-wire transmitter configuration using the designated channel setting pins.
- Route 4-20 mA signal wiring separately from high-voltage power and high-current switching conductors where practical.
- Maintain correct signal polarity when connecting current-loop wiring.
- Connect cable shields according to the applicable Yokogawa installation and plant grounding practice.
- Verify the transmitter loop voltage and current requirements against the specified module transmitter power supply.
- Confirm terminal tightness before energizing the system.
- For HART operation, verify that the field loop wiring and connected transmitter support the required HART communication path.
- Do not exceed the specified 24 mA allowable input current or 25 mA transmitter supply current limit.
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