Overview
Configured for 4-20 mA DC signal acquisition in Yokogawa DCS platforms, the Yokogawa AAI135-S00/K4A00 (AAI135 Analog Input Module) provides 8 isolated input channels for standardized transmitter signals.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI135-S00/K4A00 |
| Base Model | AAI135 |
| Brand | Yokogawa |
| Module Type | Analog Input Module, isolated channels |
| System Platform | Yokogawa DCS, including CENTUM VP and CENTUM CS series |
| Number of Channels | 8 |
| Input Signal | 4-20 mA DC |
| Maximum Allowable Input | 24 mA |
| Input Resistance | 270 to 350 ohm, depending on input current |
| Accuracy | +/- 16 uA, approximately +/- 0.1% F.S. |
| Data Update Period | 10 ms |
| Transmitter Supply | 19.0 VDC or higher at 20 mA; 25.5 VDC or lower at 0 mA |
| HART Communication | Supported |
| Channel Isolation | Input-to-system isolation |
| Withstanding Voltage | 1500 VAC between input and system for 1 minute |
| Maximum Current Consumption | 230 mA at 5 VDC; 540 mA at 24 VDC |
| External Connection | Pressure clamp terminal, MIL connector cable, or dedicated KS cable |
| Weight | Approx. 0.3 kg |
| Power Consumption | Maximum current consumption: 230 mA at 5 VDC and 540 mA at 24 VDC |
Yokogawa DCS Signal and Isolation Characteristics
The AAI135 accepts standardized 4-20 mA DC signals from 2-wire or 4-wire field transmitters. Each input channel provides electrical separation from the system side, which limits the transfer of field-side electrical disturbances into the DCS circuitry.
The module supports HART communication over compatible 4-20 mA loops. Furthermore, its 10 ms data update period provides cyclic acquisition of input values for controller processing.
The specified input resistance ranges from 270 to 350 ohm with power applied. The module also withstands 1500 VAC between the input and system sides for 1 minute.
Frequently Asked Questions (FAQ)
Q: What input signal does the AAI135-S00/K4A00 accept?
A: It accepts 4-20 mA DC analog signals and permits a maximum input current of 24 mA.
Q: Does the module provide electrical isolation?
A: Yes. The supplied specifications identify the input channels as isolated and specify 1500 VAC withstand voltage between input and system for 1 minute.
Q: What transmitter supply voltage does the module provide?
A: The specified transmitter supply is 19.0 VDC or higher at 20 mA and 25.5 VDC or lower at 0 mA.
Field Installation Guidelines
- Confirm the module model and terminal configuration before wiring.
- Keep 4-20 mA signal wiring separated from high-voltage and high-current power conductors.
- Use shielded instrumentation cable where the installation requires additional noise control.
- Terminate cable shields according to the DCS grounding design and site electrical standard.
- Verify transmitter polarity before applying loop power.
- Check the loop current against the specified 4-20 mA operating range before commissioning.
- Confirm terminal connections and cable routing before energizing the module.
- Do not exceed the specified 24 mA maximum input current.
- Verify HART communication compatibility when connecting HART-enabled field instruments.
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