Overview
The Yokogawa AAI135-H00/K4A00, also cataloged as the AAI135 Analog Input Module, provides isolated 4-20 mA current signal acquisition with HART communication capability for Yokogawa CENTUM VP and related DCS I/O platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI135-H00/K4A00 |
| Brand | Yokogawa |
| Product Type | Analog Input Module (Current Input) |
| Origin | Japan |
| Weight | 0.3 kg |
| Module Series | AAI135 Analog Input Module |
| Input Channels | 8-channel isolated input |
| Input Signal | 4-20 mA DC |
| Communication Protocol | HART digital communication |
| Channel Isolation | Isolated channels |
| Allowable Input Current | 25 mA |
| Input Resistance (Power ON) | 290 ohm at 20 mA to 450 ohm at 4 mA |
| Input Resistance (Power OFF) | 500 k ohm or larger |
| Accuracy | ±16 uA |
| Withstanding Voltage (Input/System) | 500 V AC for 1 minute |
| Withstanding Voltage (Input Channels) | 500 V AC for 1 minute |
| Cable Interface Option | KS Cable Interface Adapter ATK4A-00 |
4-20 mA HART Process Signal Interface
The Yokogawa AAI135-H00/K4A00 integrates isolated analog input channels with HART protocol support. The module receives 4-20 mA field transmitter signals and transfers measured values through the Yokogawa DCS I/O architecture.
Furthermore, the isolated channel design separates individual input circuits and reduces signal interference between field loops. The module supports HART digital communication for transmitter configuration and diagnostic data exchange through the current loop.
Frequently Asked Questions
Q: What input signal does the Yokogawa AAI135-H00/K4A00 accept?
A: The module accepts 4-20 mA current input signals through 8 isolated input channels.
Q: Does the AAI135-H00/K4A00 support HART communication?
A: Yes. The H suffix indicates HART digital communication capability for compatible field transmitters.
Q: What isolation voltage does the module provide?
A: The module provides 500 V AC withstand voltage for 1 minute between input and system, and between input channels.
Field Installation Guidelines
Install the AAI135-H00/K4A00 in the designated Yokogawa DCS I/O subsystem slot according to the system hardware manual.
Use shielded instrumentation cables for 4-20 mA field wiring and connect cable shields according to the site grounding standard. Keep analog signal wiring separated from high-voltage power cables and switching circuits to reduce electrical noise coupling.
Verify transmitter loop polarity before energizing the module. Confirm that field devices operate within the specified current input range and that HART communication wiring follows the applicable instrument loop requirements.
The KS Cable Interface Adapter ATK4A-00 should be installed according to Yokogawa cable connection instructions to maintain correct signal routing and terminal identification.
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