YS1700-201/A34 Yokogawa

YS1700-201/A34 Yokogawa Analog Output Modules

Product  Description：

Yokogawa Analog Output Modules are high-reliability instruments designed for the CENTUM VP distributed control system (DCS) and the STARDOM network-based control system. These modules convert precise digital commands from the controller’s processor into continuous analog electrical signals. They are primarily used to modulate final control elements in process industries, ensuring precise control over variable field hardware such as control valves, dampers, and speed governors.

Product Parameters

The technical baseline of Yokogawa Analog Output Modules is built around signal accuracy, circuit isolation, and system compatibility:

• Output Signal Formats: Supports industry-standard signals, including 4-20mA DC current loops and 1-5V DC voltage ranges.

• Number of Output Channels: Typically available in 8-channel or 16-channel configurations to match various field infrastructure densities.

• Digital-to-Analog Resolution: High-resolution internal processing, usually utilizing a 16-bit D/A converter to ensure microscopic adjustments.

• Output Response Time: Fast step-response capability, with signal update cycles typically completed within a few milliseconds.

• Accuracy and Temperature Drift: High-precision performance with a total accuracy often within 0.1 percent of the full scale over a wide temperature range.

• Isolation Voltage: Robust galvanic isolation between the system channels and the internal system bus, rated to handle high dielectric stress.

Product Advantages

Yokogawa Analog Output Modules are distinguished by their high availability and diagnostic features designed for continuous process industries:

• Mission-Critical Reliability: Engineered for dual-redundant configurations, allowing a backup module to take over seamlessly without any bump in the output signal if the primary module encounters an issue.

• Advanced Valve Diagnostics: Supports HART communication, which allows the module to pass digital diagnostic data between the smart valve positioner and the DCS maintenance software simultaneously with the analog signal.

• Output Readback Monitoring: Features internal readback circuits that continuously check the actual output current against the commanded value, immediately alerting operators if a loop break or wiring fault occurs.

• Built-in Safety Loop Actions: Configurable "fallback" states allow the module to output a specific predefined value (such as hold last value, drive to maximum, or drop to 0mA) if communication with the main processor is completely lost.

• Low Heat Generation: Advanced power management design minimizes internal power dissipation, keeping the module cool even when all channels are running at a maximum 20mA load.

Product Applications

These modules are deployed globally in harsh and continuous industrial settings:

• Petrochemical Refining: Controlling the position of critical safety and flow control valves in high-pressure distillation columns and cracking units.

• Power Plant Management: Regulating governor valves on steam turbines and controlling air dampers to optimize boiler combustion efficiency.

• LNG Terminals: Managing precise cryogenic flow valves during liquid natural gas transport and storage operations.

• Chemical Processing: Driving variable speed pumps and dosing valves to maintain strict chemical ratios in continuous reaction processes.

• Water Purification: Controlling large motorized gates and chemical injection pumps to maintain target water quality standards across utility infrastructure.

Important Precautions

To maintain the accuracy and safety of the system, the following operational and installation guidelines must be followed:

• External Load Limits: Always check the allowable load resistance of the module. Exceeding the maximum rated loop resistance will prevent the module from driving the full 20mA signal.

• Correct Redundancy Alignment: When setting up a dual-redundant pair, ensure both modules are installed on the same base unit and that their node addresses are properly matched in the engineering software before commissioning.

• Separate Signal Routing: Route the 4-20mA analog output cables away from high-voltage power lines and variable frequency drives to prevent electromagnetic noise from causing signal fluctuations.

• Single-Point Shielding: Ensure that the instrument cable shields are grounded at only one end, preferably at the DCS cabinet ground, to avoid creating ground loops that can distort the output signal.

• Strict Power Sequencing: When performing system maintenance, never force an interface module out of its backplane without following the recommended software-guided hot-swap procedure to avoid generating voltage spikes on adjacent active channels.

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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JUSTWELL PTE. LTD

Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.