Overview
Configured for analog current signal acquisition and output execution in CENTUM VP and CENTUM CS 3000 systems, the Yokogawa AAI841-H00/K4A00 (AAI841 Analog I/O Module) provides direct physical and electrical signal processing through 8 input channels and 8 output channels.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI841-H00/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Approx. 0.3 kg |
| Power Consumption | 310 mA at 5 VDC; 500 mA at 24 VDC |
| Module Type | Non-isolated Analog I/O Module |
| Input Channels | 8 channels |
| Output Channels | 8 channels |
| Input Signal | 4-20 mA DC; 1-5 V DC |
| Output Signal | 4-20 mA DC |
| Communication Protocol | HART protocol supported |
| System Configuration | Supports dual-redundant configuration |
| External Interface | KS Cable Interface Adapter ATK4A-00 |
| Input Accuracy | +/- 16 uA |
| Output Accuracy | +/- 48 uA |
| Input Step Response Time | 100 ms |
| Output Step Response Time | 40 ms |
| Data Update Period | 10 ms |
| Allowable Output Load | 0 to 750 ohm |
| Circuit Open Detection | Activated below 0.65 mA output current |
| Allowable Input Current | 25 mA |
| Allowable Input Voltage | +/- 7.5 VDC |
Yokogawa DCS Analog Signal and HART Loop Characteristics
The AAI841-H00/K4A00 processes standard 4-20 mA field signals with integrated HART communication support for compatible transmitters. The module accepts analog input signals through 8 input channels and generates 4-20 mA output signals through 8 output channels.
Furthermore, the module maintains signal processing performance with a 10 ms data update period and provides input and output response functions for closed-loop control applications. The non-isolated channel structure allows compact installation within Yokogawa field I/O configurations.
The HART loop protocol function enables digital communication over the analog current circuit. In addition, the module supports transmitter power supply output with a range of 14.8 V or higher at 20 mA load conditions and 26.4 V or lower at 0 mA conditions.
Frequently Asked Questions
Q: Does the AAI841-H00/K4A00 support HART communication on all channels?
A: The module supports HART protocol communication through compatible current signal channels. Field device compatibility depends on transmitter configuration and loop wiring conditions.
Q: Is the AAI841-H00/K4A00 an isolated analog module?
A: No. The AAI841-H00/K4A00 is a non-isolated analog I/O module with 8 input channels and 8 output channels.
Q: What interface adapter is required for external connection?
A: The module connects through the KS Cable Interface Adapter ATK4A-00.
Field Installation Guidelines
- Install the module according to Yokogawa CENTUM VP or CENTUM CS 3000 hardware configuration requirements.
- Verify that field wiring matches the specified 4-20 mA DC or 1-5 V DC signal range before connection.
- Use shielded cables for analog signal wiring and connect cable shields according to the plant grounding standard.
- Separate analog signal cables from high-voltage power cables and switching circuits to reduce electrical interference.
- Confirm HART communication wiring polarity and loop resistance before commissioning.
- Check transmitter power supply requirements before connecting external field instruments.
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