Overview
Configured for isolated 4-20 mA signal conversion in Yokogawa ESB bus node units and field control units, the Yokogawa AAI835-S50 (AAI835 Analog Input Module) provides direct electrical acquisition and HART data communication functions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-S50 |
| Brand | Yokogawa |
| Product Type | Analog Input Module |
| Input Channels | 16 channels, isolated |
| Input Signal | 4-20 mA |
| Signal Function | Analog signal conversion to internal FCS process data |
| HART Communication | Supported through integrated HART modem |
| Maximum HART Devices | 16 devices per module |
| HART Variables | Maximum 32 points per module |
| HART Multidrop Connection | Maximum 5 input devices per channel |
| HART Variable Refresh Cycle | 1 second per device; 17 seconds per ESB bus connection with 16 devices |
| Installation System | ESB bus node units ANB10S, ANB10D; Optical ESB bus node units ANB11S, ANB11D; FIO field control units AFV30S, AFV30D, AFV40S, AFV40D, AFV10S, AFV10D |
| Origin | Japan |
4-20 mA HART Process Signal Interface
The AAI835-S50 performs analog input conversion by receiving field current signals and converting them into internal digital process values for field control stations. The module uses isolated input channels to separate field circuits and internal control data paths.
In addition, the integrated HART modem allows direct communication with HART field devices. The module supports HART variable communication, on-demand communication, and hand held terminal communication. Therefore, process variables from connected HART devices can be handled as standard input data through the FCS terminal connection.
The module supports up to 16 HART devices and 32 HART variables per module. Moreover, HART multidrop operation allows connection of up to 5 input devices per channel, but it supports input devices only and does not provide analog value transmission or burst mode functions.
Frequently Asked Questions
Q: Does the AAI835-S50 provide electrical isolation between input channels?
A: Yes. The module provides isolated 4-20 mA analog input channels for field signal acquisition and internal process data conversion.
Q: How does the module handle HART communication?
A: The module uses an integrated HART modem to communicate directly with connected HART devices and process HART variables as input data.
Q: Can the AAI835-S50 connect HART multidrop devices?
A: Yes. The module supports HART multidrop connections with up to 5 input devices per channel. Analog output values and burst communication are not supported in this mode.
Field Installation Guidelines
- Install the AAI835-S50 only in supported Yokogawa ESB bus node units, Optical ESB bus node units, or FIO field control units.
- Connect 4-20 mA field wiring according to the terminal assignment defined by the system hardware manual.
- Use shielded instrumentation cables for analog signal wiring where required by the installation environment.
- Connect cable shields following the plant grounding design to reduce electrical interference.
- Separate analog signal cables from high-current power cables and switching circuits to minimize noise coupling.
- Verify HART device addressing before enabling multidrop communication.
- Confirm module recognition and channel status through the Yokogawa control system engineering tools before commissioning.
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