Overview
The Yokogawa AAI135-S50, also cataloged as the AAI135-S50 Analog I/O Module, operates as a dedicated hardware component for converting field analog signals and HART communication data within Yokogawa FIO and ESB bus node systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI135-S50 |
| Brand | Yokogawa |
| Product Type | Analog I/O Module |
| Function | Analog signal conversion between field devices and Field Control Station (FCS) internal data |
| System Compatibility | ESB Bus Node Units ANB10S, ANB10D; Optical ESB Bus Node Units ANB11S, ANB11D; FIO Field Control Units AFV30S, AFV30D, AFV40S, AFV40D, AFV10S, AFV10D |
| Input Function | Receives field analog signals and converts them into internal control data |
| Output Function | Converts FCS internal data into analog output signals |
| HART Communication | Supported through integrated HART modem |
| Maximum HART Devices | 16 devices per module |
| Maximum HART Variables | 32 points per module |
| HART Multidrop Connection | Maximum 5 input devices per channel |
| HART Variable Refresh Cycle | 1 second per device; maximum 17 seconds per ESB bus connection with 16 devices |
| HART Data Type | Input process data via %Z terminal connection |
| Origin | Japan |
4-20 mA HART Loop Communication and Signal Processing
The Yokogawa AAI135-S50 integrates HART modem functionality to communicate directly with HART field devices connected to analog channels. Therefore, the module can acquire HART variables as additional process input data through the %Z terminal connection.
The module supports up to 16 HART devices and processes up to 32 HART variables. In addition, the HART multidrop function allows connection of up to 5 input devices per channel. However, this configuration only supports HART variable communication and does not transfer analog measurement values or burst communication data.
The module applies DCS-oriented signal conversion processing, converting field analog inputs into FCS internal data for control execution. It also converts internal FCS values into analog output signals when required by the configured application.
Frequently Asked Questions
Q: Does the Yokogawa AAI135-S50 support direct HART device communication?
A: Yes. The module includes HART modem functionality and allows direct connection with HART field devices for variable communication and maintenance communication.
Q: How many HART devices can one AAI135-S50 module handle?
A: The module supports a maximum of 16 HART devices per module and processes up to 32 HART variables.
Q: Can HART multidrop mode transmit analog process values or burst messages?
A: No. HART multidrop mode supports input device communication only. Analog data value transmission and burst function are not supported.
Field Installation Guidelines
Install the Yokogawa AAI135-S50 in the specified ESB bus node unit, Optical ESB bus node unit, or FIO Field Control Unit according to the applicable hardware installation manual.
Use proper signal wiring practices for analog field connections. Separate analog signal cables from high-voltage power wiring and high-current switching lines to reduce electrical interference.
Connect cable shields according to the system grounding design. Avoid multiple grounding points that may introduce ground loops into analog measurement circuits.
Verify field device wiring polarity before applying power. Confirm that connected HART devices match the supported input configuration before commissioning communication functions.
During maintenance operations, check module seating, terminal connections, and bus communication status before replacing or removing hardware.
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