Overview
The Yokogawa AAI835-H50/13S00, also cataloged as the AAI835 Analog I/O Module, operates as a dedicated hardware component for isolated 4-20 mA signal acquisition and output control within Yokogawa CENTUM VP and CENTUM CS 3000 Field Control Station platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-H50/13S00 |
| Brand | Yokogawa |
| Product Type | Isolated Analog I/O Module |
| Origin | Japan |
| System Compatibility | Yokogawa CENTUM VP / CENTUM CS 3000 FCS |
| Input Channels | 4 channels, isolated current input |
| Output Channels | 4 channels, isolated current output |
| Signal Range | 4-20 mA DC |
| Communication Function | HART communication support |
| Isolation Method | Channel-to-channel and channel-to-system isolation |
| Data Update Period | 10 ms |
| Input Accuracy | +/- 16 uA |
| Output Accuracy | +/- 48 uA |
| Input Step Response Time | 100 ms |
| Output Step Response Time | 40 ms |
| Allowable Input Current | 25 mA DC |
| Allowable Load Resistance | 0 to 750 ohm |
| Transmitter Power Supply | 14.8 V DC or higher at 20 mA; 26.4 V DC or lower at 0 mA |
| Transmitter Wiring | Supports 2-wire and 4-wire transmitters |
| Open Circuit Detection | Detects output current below 0.65 mA |
| Weight | Approx. 0.3 kg excluding terminal block |
| Power Consumption | 310 mA at 5 V DC; 500 mA at 24 V DC |
| Withstanding Voltage | 1500 V AC for 1 minute between I/O and system |
| Temperature Drift | +/- 0.1% / 10 deg C |
| Terminal Block Option | ATI3S-00 pressure clamp terminal block |
4-20 mA HART Loop Protocol and Channel Isolation
The AAI835-H50/13S00 integrates Yokogawa process control I/O functions with HART communication capability. The module exchanges analog current signals and digital HART parameters through the same field wiring loop.
Furthermore, each input and output channel maintains electrical isolation. This design reduces signal interference between field devices and separates individual measurement circuits. The module supports smart transmitters through HART parameter access, device diagnostics, and configuration data transfer.
The isolated analog architecture supports 2-wire and 4-wire transmitter connections. Therefore, the module can process different field transmitter wiring configurations without external signal conversion hardware.
Frequently Asked Questions
Q: Does the AAI835-H50/13S00 support HART communication on all channels?
A: Yes. The module provides HART communication functionality for connected 4-20 mA field devices through its analog channels.
Q: What isolation functions does the module provide?
A: The module provides channel-to-channel isolation and channel-to-system isolation to separate field signal circuits from the control system.
Q: What transmitter types can connect to this module?
A: The module supports both 2-wire and 4-wire transmitters through configurable channel wiring.
Field Installation Guidelines
- Install the module according to Yokogawa FCS hardware installation procedures and confirm slot compatibility before mounting.
- Use shielded instrumentation cables for 4-20 mA field loops and terminate cable shields according to site grounding practices.
- Separate analog signal wiring from high-voltage power cables and switching circuits to reduce electromagnetic interference.
- Verify transmitter polarity, loop wiring, and current direction before applying field power.
- Confirm HART communication settings after installation to ensure correct device parameter exchange.
- Use the specified terminal block type when connecting field wiring to maintain correct mechanical and electrical interfaces.
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