Overview
Configured for 4-20 mA DC signal acquisition in Yokogawa CENTUM VP and CENTUM CS 3000 systems, the Yokogawa AAI135-S00 (AAI135 Analog Input Module) provides direct electrical conversion of field transmitter signals through 8 isolated input channels.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI135-S00 |
| Brand | Yokogawa |
| Origin | Japan |
| Module Type | Analog Input Module (Isolated Channels) |
| System Compatibility | CENTUM VP, CENTUM CS 3000 DCS |
| Input Channels | 8 channels, channel-to-channel isolated |
| Input Signal | 4-20 mA DC |
| Input Impedance | 290 to 450 ohm (Power ON, current dependent); >= 500 kohm (Power OFF) |
| Allowable Input Current | 25 mA DC max. |
| Measurement Accuracy | +/- 16 uA (+/- 0.1% of span) |
| Data Update Period | 10 ms |
| Temperature Drift | +/- 16 uA per 10 deg C |
| Transmitter Power Supply | >= 15.0 V DC at 20 mA |
| Withstanding Voltage | 500 V AC for 1 min between field and system, channel-to-channel |
| Weight | Approx. 0.3 kg |
| Operating Temp | 0 deg C to 60 deg C |
| Power Consumption | 360 mA at 5 V DC; 450 mA at 24 V DC |
| Mounting Interface | FIO / ESB / ER Bus Node Units |
4-20 mA Loop Isolation and DCS Signal Processing
The AAI135-S00 processes analog current signals from field transmitters and transfers converted data to Yokogawa CENTUM controllers. Each input channel uses individual electrical isolation, therefore the module limits ground loop influence and prevents one field circuit fault from affecting adjacent channels.
In addition, the module supports standard process instrumentation loops based on 4-20 mA signals. The isolated input design maintains signal separation between field wiring and system-side processing circuits.
The module integrates with Yokogawa DCS I/O architectures and supports dual-redundant system configurations when installed with compatible FIO hardware.
Frequently Asked Questions
Q: Does the Yokogawa AAI135-S00 support channel-to-channel isolation?
A: Yes. The module provides individual isolation between input channels and between field circuits and the system side.
Q: What type of field signals can the AAI135-S00 measure?
A: The module accepts standard 4-20 mA DC analog signals from process transmitters and measurement devices.
Q: Can the AAI135-S00 operate in redundant DCS configurations?
A: Yes. The module supports Yokogawa dual-redundant FIO configurations when installed with compatible system components.
Field Installation Guidelines
- Install the AAI135-S00 in the specified Yokogawa FIO, ESB, or ER Bus Node Unit slot according to system hardware documentation.
- Use shielded instrumentation cables for analog signal wiring to reduce electromagnetic interference.
- Connect cable shields according to the site grounding standard and avoid multiple grounding points that may introduce ground loops.
- Separate low-level analog input wiring from high-power AC cables and switching circuits.
- Verify transmitter loop polarity before applying field power.
- Confirm module seating, terminal connections, and bus interface status before system commissioning.
- Check input signal scaling inside the CENTUM engineering environment after physical installation.
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