Overview
The Yokogawa AAI835-S00/K4A00, also cataloged as the AAI835-S00/K4A00 Analog I/O Module, operates as a dedicated signal conversion hardware component for analog field signal processing within Yokogawa ESB bus node units and Field Control Units (FIO).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-S00/K4A00 |
| Brand | Yokogawa |
| Product Type | Analog I/O Module |
| 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 |
| Signal Function | Analog input and output signal conversion between field devices and Field Control Station internal data |
| HART Communication | Integrated HART modem support |
| 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; 17 seconds per ESB bus connection when 16 devices are connected |
| HART Communication Type | HART variable communication, on-demand communication, and handheld terminal (HHT) communication |
| Analog Signal Interface | Field analog signal acquisition and FCS internal analog output conversion |
| HART Multidrop Limitation | Supports input devices only; analog value and burst function are not supported |
| Origin | Japan |
HART Communication and Process Signal Interface
The Yokogawa AAI835-S00/K4A00 integrates HART communication capability through an internal HART modem. Therefore, the module can directly connect HART field devices and process digital HART variables together with conventional analog signals.
The module processes HART variables as standard process input data through %Z terminal connections. In addition, it supports on-demand communication and handheld terminal communication for device configuration and diagnostic access.
The HART communication function supports up to 16 HART devices per module and manages up to 32 HART variables. For multidrop configurations, the module allows up to 5 input devices per channel; however, it does not support analog data value transmission or burst mode operation in this connection mode.
The Yokogawa AAI835-S00/K4A00 applies standard process control communication methods, including 4-20 mA HART loop protocol handling and channel signal management within Yokogawa CENTUM and FIO architectures. Furthermore, the module maintains electrical separation between field wiring and internal control data processing paths.
Frequently Asked Questions
Q: What systems can install the Yokogawa AAI835-S00/K4A00 module?
A: The module installs in Yokogawa ESB bus node units, Optical ESB bus node units, and FIO Field Control Units including ANB10, ANB11, AFV30, AFV40, and AFV10 series configurations.
Q: How many HART devices can the AAI835-S00/K4A00 communicate with?
A: The module supports a maximum of 16 HART devices per module and processes up to 32 HART variables.
Q: Does the HART multidrop function support analog output or burst communication?
A: No. HART multidrop connection supports input devices only and does not support analog data value transmission or burst function.
Field Installation Guidelines
Install the Yokogawa AAI835-S00/K4A00 module according to the specified Yokogawa FIO or ESB bus node hardware configuration.
- Verify the module slot assignment before installation to ensure compatibility with the target ANB or AFV unit.
- Connect field analog wiring according to the designated terminal configuration and signal polarity.
- Use shielded instrumentation cables for analog and HART communication wiring where required by the installation environment.
- Connect cable shields according to plant grounding standards to reduce electromagnetic interference.
- Separate low-level analog signal wiring from high-voltage power cables and high-current switching circuits.
- Confirm HART device addressing before enabling multidrop communication.
- Verify that connected HART devices operate within the supported input-only multidrop configuration.
- Check module status indicators and control system diagnostics after installation.
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