Overview
Configured for 4-20 mA analog signal conversion and HART communication in Yokogawa CENTUM VP and CENTUM CS 3000 DCS platforms, the Yokogawa AAI835-H50 (AAI141 Analog Input Module) provides direct electrical signal acquisition from field devices and converts input data for Field Control Stations (FCS).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-H50 |
| Brand | Yokogawa |
| Origin | Not specified |
| Module Type | Analog Input Module |
| Base Model | AAI141 |
| Number of Input Channels | 16 channels, isolated |
| Input Signal | 4-20 mA |
| HART Communication | Supported with integrated HART modem |
| Maximum HART Devices | 16 devices per module |
| Maximum HART Variables | 32 points per module |
| HART Multidrop Connection | Maximum 5 devices per channel |
| HART Variable Refresh Cycle | 1 second per device |
| Supported Systems | CENTUM VP, CENTUM CS 3000, FIO field control units |
| Installation Units | ANB10S, ANB10D, ANB11S, ANB11D, AFV30S, AFV30D, AFV40, AFV40D, AFV10, AFV10D |
4-20 mA HART Process Signal Interface
The Yokogawa AAI835-H50 integrates analog input conversion and HART communication functions within a single I/O module. The module receives 4-20 mA field signals and converts them into internal process data for FCS processing.
The HART modem allows direct connection of HART field devices. Therefore, the module can acquire additional HART variables through the same analog input loop. HART variables can be processed as standard input data through the %Z terminal connection.
The module supports channel isolation to separate field input circuits. This design reduces signal interference between connected field devices and maintains stable analog measurement processing.
Frequently Asked Questions
Q: How many HART devices can the AAI835-H50 communicate with?
A: The AAI835-H50 supports up to 16 HART devices per module and up to 32 HART variables.
Q: Does the AAI835-H50 support HART multidrop connections?
A: Yes. The module supports HART multidrop connections with a maximum of 5 devices per channel.
Q: Can the AAI835-H50 operate with Yokogawa FIO systems?
A: Yes. The module installs in Yokogawa FIO configurations including ANB bus node units and AFV field control units.
Field Installation Guidelines
Install the AAI835-H50 module only in supported Yokogawa node units or FIO field control units. Verify the module slot configuration before insertion.
Connect 4-20 mA field wiring according to the terminal assignment documentation. Use shielded signal cables for analog loops and connect cable shields according to the site grounding standard.
Separate analog signal wiring from high-voltage power cables and switching circuits to reduce electromagnetic interference. Confirm field device polarity and loop continuity before applying system power.
Check HART communication wiring after installation. Verify that connected field devices respond correctly through the FCS engineering interface.
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