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- Yokogawa
- AAP849-S50
- Pulse Input/Analog Output Module
- Japan
- 130 × 32.8 × 127.2 mm
- 0.3 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa AAP849-S50 is an integrated Pulse Input and Analog Output Module used in Yokogawa CENTUM distributed control systems. It is designed to simultaneously acquire pulse signals from field devices and provide analog control outputs, enabling efficient process measurement and control in industrial automation systems.
This module is commonly used where flow measurement, turbine monitoring, and analog valve control are required within a single compact hardware unit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa |
| Model | AAP849-S50 |
| Product Type | Pulse Input / Analog Output Module |
| System Compatibility | Yokogawa CENTUM / FIO systems |
| Function | Pulse signal acquisition + analog signal output |
| Input Channels | 8-channel pulse input |
| Output Channels | 4-channel analog output (4–20 mA) |
| Input Types | Contact, voltage pulse, current pulse |
| Input Frequency Range | Up to ~10 kHz |
| Signal Isolation | Field-to-system isolation |
| Processing Function | Pulse counting + signal conversion |
| Output Type | Analog current output (4–20 mA) |
| Control Role | Process control loop output module |
| Mounting Type | Rack-mounted module |
| Operating Environment | Industrial control cabinet |
| Humidity Range | 5%–95% non-condensing |
| Dimensions | 130 × 32.8 × 127.2 mm |
| Weight | 0.3 kg |
Function and Working Principle
The AAP849-S50 operates as a dual-function process interface module.
Its core functions include:
- Receiving pulse signals from field instruments (e.g., flow meters, turbine sensors)
- Counting and processing high-speed pulse inputs
- Converting pulse data into process variables
- Outputting analog control signals (4–20 mA) to field devices
- Supporting closed-loop control between measurement and actuation
- Providing electrical isolation to improve system stability
It functions as a combined measurement + control interface module.
Role in Industrial Control Systems
Within Yokogawa DCS architectures, the AAP849-S50 provides:
- Integrated pulse measurement and analog control capability
- Real-time process variable acquisition (flow, speed, count)
- Direct analog output to valves and actuators
- Reduced system footprint by combining I/O functions
- Reliable operation in high-noise industrial environments
Industrial Applications
The Yokogawa AAP849-S50 is widely used in:
- Flow metering and totalization systems
- Turbine speed and rotation monitoring
- Oil and gas processing plants
- Chemical and petrochemical industries
- Power generation facilities
- Process control and automation systems
Installation and System Integration
Recommended installation practices include:
- Installing in Yokogawa FIO or CENTUM I/O racks
- Ensuring correct backplane connection and module alignment
- Wiring pulse inputs according to signal type (contact/voltage/current)
- Configuring analog output scaling (4–20 mA loop)
- Performing loop testing and calibration during commissioning
Compatible System Components
The AAP849-S50 typically works with:
- Yokogawa CENTUM controllers
- Field pulse devices (flow meters, encoders, turbines)
- Analog output-driven actuators and valves
- Other FIO-based I/O modules
- Communication interface modules
- Process monitoring systems
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| AAP849-S50 | Pulse + Analog module | Combined I/O function | Process control |
| AAP135-S53/K4A00 | Pulse input module | High-speed acquisition | Monitoring systems |
| AAP135-S50/K4A00 | Pulse input module | Multi-signal input | Automation |
| AAP135-S00/I3S00 | Analog I/O module | General signal interface | Control systems |
| AAI835-S53 | Analog I/O module | Multi-channel analog processing | Industrial control |
Key Advantages
- Combines pulse input and analog output in one module
- Reduces cabinet space and wiring complexity
- High-speed pulse processing capability
- Stable 4–20 mA analog output control
- Strong electrical isolation for reliability
- Suitable for continuous process control applications
Technical FAQs
What is the AAP849-S50 used for?
It is used for both pulse signal acquisition and analog signal output in industrial control systems.
How many inputs and outputs does it have?
It typically has 8 pulse inputs and 4 analog outputs.
What signals does it handle?
Contact, voltage pulse, current pulse inputs, and 4–20 mA analog outputs.
Is it a controller?
No, it is an I/O interface module used within a DCS system.
Conclusion
The Yokogawa AAP849-S50 is a multifunctional I/O module that integrates pulse input and analog output capabilities. It provides efficient signal processing, compact system design, and reliable performance for industrial automation and process control applications.