SM21-AG4 Yokogawa

SM21-AG4 Yokogawa Output Module

Product  Description：

Yokogawa Output Modules, widely utilized within the CENTUM Distributed Control System (DCS) and FA-M3 range-free controllers, are high-reliability industrial components designed to control field-side actuators and devices. These modules receive processed digital commands from the central control unit and convert them into electrical signals capable of driving valves, motor starters, relays, indicators, and various other physical control elements in a process plant.

Product Parameters

The technical profile of a Yokogawa Output Module centers on signal accuracy, load capacity, and system integrity:

• Output Types: Available in analog output formats (such as 4-20mA DC or 1-5V DC) for continuous control, and digital/discrete output formats (such as relay contact, transistor, or triac) for on/off states.

• Channel Density: Offered in configurations ranging from 4, 8, 16, to 32 channels per module, allowing for optimal optimization of control cabinet spaces.

• Digital-to-Analog Resolution: For analog modules, high-precision 12-bit to 16-bit conversion ensures extremely fine control over modulating valves and variable speed drives.

• External Power Supply: Typically requires a field-side power source of 24V DC for transistor outputs, or handles up to 250V AC / 30V DC for relay-based contacts.

• Response and Update Time: Fast data refreshing rates, often under 1 millisecond for discrete modules and a few milliseconds for analog loops, ensuring real-time process adjustments.

• Isolation Withstand Voltage: Robust galvanic isolation between internal system circuitry and external field wiring, commonly rated at 1500V AC or higher to prevent fault propagation.

Product Advantages

Yokogawa's output technology is recognized globally for its stringent quality and contribution to plant uptime:

• High Availability through Redundancy: Many Yokogawa output modules support dual-redundant configurations, where a backup module automatically and seamlessly takes over control if the primary unit detects an internal failure.

• Advanced Line Diagnostics: Features integrated hardware diagnostics capable of detecting field-side abnormalities such as open circuits (wire-breaks) and short circuits, instantly alerting operators via the DCS interface.

• Output Status Hold Function: Includes a configurable safety feature that allows the output channels to either hold their last valid value or drop to a pre-defined safe state (fail-safe) if communication with the main CPU is lost.

• Superior Thermal and Environmental Resistance: Built to withstand harsh industrial environments, with optional conformal coatings that protect the delicate internal circuitry from corrosive gases, moisture, and dust.

• Hot-Swapping Capability: Designed to allow the replacement of a faulty module while the system is live and powered, ensuring that surrounding plant processes continue running without interruption.

Product Applications

These modules serve as the final control interface in critical process and manufacturing sectors:

• Petrochemical and Refining: Governing the precise position of control valves, emergency shutdown valves, and heating elements across complex distillation units.

• Power Generation: Managing the excitation systems, fuel feed valves, and cooling water pumps in thermal, nuclear, and hydroelectric facilities.

• Water and Wastewater Treatment: Operating chemical dosing pumps, large motorized isolation valves, and aeration blowers based on automated logic routines.

• Pharmaceutical and Food Production: Controlling proportional valves and mixing actuators in strictly regulated batch processing environments to maintain exact product recipes.

• Pulp and Paper Mills: Coordinating the speed reference signals for large roller motors and steam control valves to ensure consistent paper thickness and quality.

Important Precautions

To guarantee safe operation and maximize the operational lifespan of the module, users must observe the following instructions:

• Load Matching: Never connect a field device that draws more current than the maximum rated load of the output channel. Overloading a transistor or relay module can cause overheating, fused contacts, or permanent hardware failure.

• Inductive Load Protection: When driving inductive loads like solenoids, mechanical relays, or magnetic contactors, always install external surge absorbers, flyback diodes, or RC snubbers across the load to neutralize back-EMF spikes.

• Proper Separation of Cables: Route high-voltage AC output lines completely separate from low-voltage DC input or communication signals to prevent electromagnetic noise from causing erratic behaviors in adjacent equipment.

• Strict Power-Off Handling for Base Units: While some modules support hot-swapping on dedicated racks, always ensure the installation manual permits live insertion for your specific model before attempting to replace a module under power.

• Tightening Torque Specification: Secure all field wiring terminal screws to the exact torque setting designated by Yokogawa. Loose connections introduce high resistance, which can lead to localized heating, signal drops, and intermittent faults.

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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