AST143-S00 Yokogawa

AST143-S00 Yokogawa Central unit

Product  Description：

Yokogawa Central Units, most notably represented by the Main Control Units (MCU) and Field Control Units (FCU) within the CENTUM Distributed Control System (DCS) and the Stardom network-based controller families, serve as the ultra-reliable core intelligence of complex processing plants. These units are responsible for executing high-level regulatory control algorithms, advanced batch processing logic, and critical sequence management. Engineered for zero downtime, they synchronize vast networks of field instruments while maintaining constant, deterministic communication with production servers and human-machine interfaces.

Product Parameters

The technical parameters of a Yokogawa Central Unit focus on processing power, memory management, and industrial network capacity:

• Processor Architecture: Utilizes specialized, high-reliability industrial microprocessors optimized for continuous calculation of PID loops and complex arithmetic functions.

• Control Loop Capacity: Capable of managing hundreds of analog loops and thousands of digital points simultaneously within a single processing node.

• Basic Instruction Execution Speed: Logic operations are executed in the microsecond or nanosecond range, ensuring instantaneous responses to process upsets.

• Control Cycle Selection: Offers configurable control cycles typically ranging from 50 milliseconds to 1 second, depending on the speed requirements of the chemical or physical process.

• Memory Protection: Equipped with battery-backed Error-Correcting Code (ECC) RAM to prevent data corruption and non-volatile flash memory for permanent storage of control strategies.

• Network Communication: Features dual-redundant Vnet/IP ports for ultra-high-speed control bus communication, alongside standard Ethernet interfaces for host connectivity.

Product Advantages

Yokogawa Central Units are highly regarded in the process industries for their structural resilience and operational availability:

• Industry-Leading Availability: Features dual-redundant CPU modules running in "Pair & Spare" or "Dual-Redundant" configurations, yielding a system availability rate often exceeding 99.999 percent.

• Seamless Online Updates: Control software, logic configurations, and hardware modules can be updated or replaced while the process is actively running without causing control discontinuities.

• High Environmental Hardness: Built to withstand aggressive industrial environments, with options for G3-class conformal coating to defend against humidity, moisture, and corrosive gases like hydrogen sulfide.

• Advanced Safety Integration: Certain central units can run standard control logic alongside certified safety-instrumented functions, maintaining physical separation while sharing data seamlessly.

• Long Operational Lifecycle: Designed with a strict commitment to backward compatibility, ensuring that old control algorithms can be migrated to newer generations of hardware without re-engineering the entire system.

Product Applications

These units are the premier choice for continuous, mission-critical operations worldwide:

• Oil and Gas Refining: Controlling distillation columns, catalytic crackers, and blending systems where precise temperature and pressure regulations are vital.

• Chemical and Petrochemical Plants: Managing complex exothermic reactions, polymerizations, and mass transfer operations that require strict safety interlocks.

• Liquefied Natural Gas Processing: Regulating the multi-stage cooling, liquefaction, and storage processes required to safely handle LNG.

• Large-Scale Power Generation: Governing boiler systems, steam turbines, and cooling towers to ensure steady electrical output to the grid.

• Pharmaceutical and Food Batching: Executing highly accurate recipe-based batch processing that complies with international regulatory standards for traceability.

Important Precautions

To preserve the exceptional reliability of the central unit, users must adhere to the following strict guidelines:

• Strict Power Redundancy: Always connect the dual power supply inputs to independent, clean power sources (such as separate Uninterruptible Power Supply systems) to ensure continuous operation.

• Systematic Cabinet Ventilation: Do not block the ventilation openings around the central unit housing. Maintain the required installation clearances inside the enclosure to prevent thermal accumulation.

• Dedicated Grounding Configuration: Connect the unit’s signal ground and protective earth ground to a dedicated, low-impedance plant instrument ground rather than a noisy electrical ground.

• Firmware Verification: Only update firmware during planned maintenance turnarounds, and always confirm that the new firmware revision perfectly matches the version of the engineering software platform.

• Static Charge Safety: The internal microcircuitry is vulnerable to electrostatic discharge. Before touching the CPU modules or adjusting dip switches, always touch a grounded metallic surface or wear a properly attached anti-static wrist strap.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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