Product Overview
Yokogawa AAI143-H50/A4S10 Analog Input Module
AAI143-H50/A4S10 Analog Input Module
The Yokogawa AAI143-H50/A4S10 is a high-density 16-channel isolated analog input module designed to acquire standard 4 to 20 mA DC process signals from field transmitters into DCS control systems. Featuring 1500V AC signal isolation, channel-by-channel 2-wire/4-wire configuration, and dual-redundancy support, it provides reliable, noise-immune data acquisition for critical industrial process automation.
Reliable Process Signal Acquisition with Yokogawa AAI143-H50/A4S10
The Yokogawa AAI143-H50/A4S10 Analog Input Module is an industrial-grade, 16-channel isolated current input module built for high-density signal integration in distributed control systems (DCS). Operating on standard 4 to 20 mA DC current loops, this module converts real-time field measurements—such as pressure, flow, temperature, and level—into precise digital data for process visualization, monitoring, and control loops. Equipped with the /A4S10 option (Model ATA4S-10 pressure clamp terminal block with built-in surge protection), the unit simplifies field wiring while protecting system electronics against outdoor voltage transients and electrical noise.
High-Density Isolation and Dual-Redundancy Protection
Process plants require continuous operation without downtime caused by field wiring faults or unexpected voltage spikes. The AAI143-H50 module delivers robust galvanic channel-to-system isolation withstand voltages up to 1500V AC for one minute. This electrical barrier prevents ground loops, reduces signal interference, and guards sensitive central control units from field surges. For mission-critical control loops, the AAI143-H50/A4S10 fully supports dual-redundant deployment. When installed in pairs, the module ensures automatic failover, maintaining uninterrupted data collection even during hardware maintenance or channel faults.
Flexible Transmitter Compatibility and Smart Features
Designed for seamless field integration, each channel on the AAI143-H50/A4S10 can be individually configured via hardware jumpers to interface with either 2-wire or 4-wire transmitters. The module supplies stable loop power (19.0 to 25.5 V DC) to 2-wire instruments, eliminating the need for external power supplies. Additionally, the module delivers rapid signal updates with a 10 ms data refresh rate, enabling fast control responses in dynamic industrial processes. Its durable circuitry withstands wide ambient operating temperatures, making it suitable for standard control rooms and remote equipment enclosures alike.
Applications
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Oil & Gas Processing: High-density current signal acquisition for wellhead control systems, pipeline monitoring, and tank farm automation.
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Chemical & Petrochemical Plants: Precision monitoring of continuous chemical reactors, distillation columns, and safety interlocks.
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Power Generation: Accurate data collection from boiler feedwater transmitters, steam temperature sensors, and turbine control loops.
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Water & Wastewater Treatment: Multi-channel flow, pressure, and analytical sensor integration across municipal and industrial treatment facilities.
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Pharmaceutical Manufacturing: Reliable 4-20 mA data acquisition ensuring strict process compliance and batch control integrity.
Technical Specifications
| Parameter | Specification Details |
| Model Number | AAI143-H50/A4S10 |
| Product Type | Analog Input Module (4 to 20 mA DC) |
| Number of Channels | 16 channels, isolated |
| Input Signal Range | 4 to 20 mA DC |
| Allowable Input Current | 24 mA max |
| Withstanding Voltage | 1500 V AC for 1 minute (Input to system) |
| Input Resistance | Power ON: 270 Ω (20 mA) to 350 Ω (4 mA); Power OFF: ≥500 kΩ |
| Measurement Accuracy | ±16 µA |
| Data Update Period | 10 ms |
| Transmitter Power Supply | 19.0 V DC or higher (at 20 mA), current limited to 25 mA |
| Transmitter Compatibility | 2-wire or 4-wire (set per channel by jumper pin) |
| Temperature Drift | ±16 µA / 10°C |
| Redundancy | Supports dual-redundant configuration |
| Power Consumption | 230 mA (5 V DC), 540 mA (24 V DC) |
| Terminal Block Option | /A4S10 (Pressure Clamp Terminal Block ATA4S-10 with surge absorber) |
| Weight | Approx. 0.3 kg |
FAQ
Q1: Can the Yokogawa AAI143-H50/A4S10 be used in a dual-redundant system?
A: Yes, the AAI143-H50 module fully supports dual-redundant configurations, allowing two modules to operate in parallel to prevent system downtime.
Q2: Does this module supply power to field transmitters?
A: Yes, it includes built-in loop power supply capability (19.0 V DC or higher at 20 mA) for 2-wire transmitters. It can also be configured for self-powered 4-wire transmitters channel-by-channel using internal setting pins.
Q3: What terminal block is included with the /A4S10 suffix option?
A: The /A4S10 option designates the ATA4S-10 pressure clamp terminal block, which features built-in surge absorbers to protect signal lines against transient overvoltages.
Q4: Is channel-to-system isolation provided on the AAI143-H50?
A: Yes, it features 1500V AC isolation between the input channels and the system logic, protecting the control system against external electrical noise and ground voltage differences.
Product documents
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