Overview
The Yokogawa AAI835-S03, also cataloged as the AAI835 Analog Input Module, processes isolated 4-20 mA field signals for Yokogawa ESB bus node units and FIO field control units. The module also provides direct HART communication with connected field devices.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-S03 |
| Replacement Model | AAI835-S53 |
| Related Hardware Specification | AAI835-S50 |
| Brand | Yokogawa |
| Product Type | Analog Input Module |
| Input Signal | 4-20 mA DC |
| Number of Channels | 16 |
| Channel Isolation | Isolated analog input |
| HART Communication | Supported |
| Maximum HART Devices | 16 devices/module |
| Maximum HART Variables | 32 points/module |
| HART Multidrop | Maximum 5 devices/channel |
| HART Variable Data Access | Via %Z terminal connection, input only |
| HART Data Refresh | 1 second/device |
| Maximum Refresh Cycle | 17 seconds per ESB bus connection with 16 HART devices |
| Compatible ESB Bus Node Units | ANB10S, ANB10D, ANB11S, ANB11D |
| Compatible FIO Field Control Units | AFV30S, AFV30D, AFV40S, AFV40D, AFV10S, AFV10D |
4-20 mA HART Communication
The AAI835-S03 uses HART modem circuitry to communicate directly with compatible HART field devices. Therefore, the module can process the analog 4-20 mA signal while also accessing HART variables from connected devices.
The module supports up to 16 HART devices and 32 HART variable points. In addition, HART multidrop operation supports up to 5 devices per channel. HART variables can enter the control system as ordinary process input data through the %Z terminal connection.
For HART data acquisition, the specified refresh interval is 1 second per device. When 16 HART devices connect to one ESB bus connection, the stated refresh cycle reaches approximately 17 seconds.
Frequently Asked Questions (FAQ)
Q: How many analog input channels does the AAI835-S03 provide?
A: The module provides 16 isolated analog input channels for 4-20 mA DC field signals.
Q: How many HART devices can the module communicate with?
A: The module supports a maximum of 16 HART devices per module and up to 5 devices per channel in HART multidrop configuration.
Q: Can HART variables be processed as control-system input data?
A: Yes. HART variables can be treated as ordinary process input data through the %Z terminal connection. The supplied specification defines this function for input data only.
Field Installation Guidelines
- Install the module in the specified Yokogawa ESB bus node or FIO field control unit configuration.
- Verify that the selected field device provides a compatible 4-20 mA signal before wiring.
- Separate analog signal wiring from high-voltage power and high-current switching conductors where practical.
- Use shielded instrumentation cable when required by the installation design, and terminate cable shields according to the site grounding specification.
- Check terminal polarity and channel assignment before energizing the field circuit.
- For HART applications, verify device addressing and multidrop configuration before commissioning.
- Keep HART communication wiring within the electrical limitations specified by the connected field devices and Yokogawa system documentation.
- The supplied data identifies AAI835-S03 as discontinued and AAI835-S53 as its replacement. Confirm system compatibility before replacing the installed module.
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