Yokogawa SDV144 Digital Input Module

Yokogawa SDV144 Digital Input Module Overview

The Yokogawa SDV144 is a 16-channel digital input module. It is a fundamental component within Yokogawa's automation platforms, designed to acquire "no-voltage contact" signals from various field instruments such as limit switches, pushbuttons, relay contacts, and proximity switches. Its primary function is to bring discrete ON/OFF status information from the plant floor into the control system for monitoring, interlocking, and control logic execution. The module offers isolation between channels and the system, enhancing reliability and noise immunity.

Product Detailed Description

• Function:

• Accepts 16 individual digital input signals (contact closure or open) from field devices.

• Converts these physical ON/OFF states into digital information that the control system (e.g., Yokogawa CENTUM VP or ProSafe-RS) can process.

• Used for status monitoring (e.g., valve open/closed, motor running/stopped), safety interlocks, sequence control, and event triggering.

• Designed for robust and reliable operation in industrial environments, often supporting dual-redundant configurations for increased availability, especially in safety applications (ProSafe-RS).

• Key Features:

• 16 Channels: Provides 16 discrete input points for connecting field devices.

• Module Isolation: Features isolation between the input signals and the system, which helps prevent ground loops and enhances noise immunity and safety.

• No-Voltage Contact Input: Designed to accept signals from dry contacts (switches, relays) where no external voltage is applied by the field device itself. The module provides a wetting voltage (typically 24 V DC) to detect the contact closure.

• External Power Supply Compatibility: Utilizes an external 24 V DC power supply for the input wetting voltage.

• High Withstand Voltage: Offers good isolation (e.g., 2 kV AC) between input signals and the system, contributing to robust and safe operation.

• Fast Response Time: Ensures quick detection of input state changes, crucial for responsive control and safety applications.

• Flexible Connection Options: Supports various external connection methods, including pressure clamp terminal blocks, MIL cables, or dedicated signal cables (like AKB331).

• Redundancy Support: The SDV144 module can be configured in a dual-redundant pair for critical applications within systems like ProSafe-RS, ensuring continuous operation even if one module fails.

• Environmental Compliance: Available with options for enhanced environmental resistance (e.g., ISA Standard G3 and wider temperature ranges for harsh conditions), and some suffix codes denote explosion protection.

Product Parameters

(Note: Specific parameters can vary slightly depending on the exact suffix and style code of the SDV144 (e.g., SDV144-S13, SDV144-S53, SDV144-S63). Always refer to the official Yokogawa General Specifications (GS) datasheet for the precise model you are using, typically found under ProSafe-RS or CENTUM VP I/O modules.)

• Model: SDV144 Digital Input Module

• Number of Inputs: 16 channels

• Input Signal Type: No-voltage contact (dry contact)

• ON State (Contact Closed): 1 kΩ maximum

• OFF State (Contact Open): 100 kΩ minimum

• Input Current: 6 mA ± 20% (when using external 24 V DC supply at 0 Ω input)

• Contact Rating: 24 V DC (+20% / -10%), 10 mA or greater

• External Power Supply (for Inputs): 24 V DC (+20% / -10%)

• Current Capacity: 200 mA (minimum requirement for the external supply)

• Instantaneous Maximum Permissible Input Voltage: 30.0 V DC

• Input Response Time: 40 ms maximum (for state change detection)

• Withstand Voltage:

• 2 kV AC (between input signal and system) for 1 minute (16-input lines collectively connected).

• May vary (e.g., 500 V AC) when specific dedicated signal cables/terminal boards are used.

• Current Consumption (Module itself):

• Approx. 290 mA maximum (at 5 V DC, from backplane)

• Approx. 140 mA maximum (at 24 V DC, from external supply)

• Weight:

• Approx. 0.36 kg (for pressure clamp terminal block or MIL cable)

• Approx. 0.41 kg (with signal cable interface adapter)

• External Connection:

• Pressure clamp terminal block (e.g., STB4S, STB4D)

• MIL cable (for flat ribbon or discrete wire, with connector covers SCCC01/SCCC02)

• Dedicated signal cable (AKB331)

• Operating Temperature Range:

• Typically 0 °C to 50 °C (Standard)

• -20 °C to 70 °C (With ISA Standard G3 compliance for harsh environments, e.g., suffix code '3' or 'C')

• Humidity: 5% to 90% RH (non-condensing)

• Certifications: CE, RoHS. Specific models may also have explosion protection certifications (e.g., ATEX, IECEx) indicated by suffix codes like '-E' or '-F'.

Product Advantages

• High Reliability and Stability: Designed for continuous operation in critical industrial processes, ensuring robust and stable performance.

• Safety Integration (ProSafe-RS): Crucial for Safety Instrumented Systems, allowing for the acquisition of safety-related digital inputs with high integrity and diagnostic capabilities. It supports dual-redundancy for maximum availability.

• Excellent Noise Immunity: Module isolation effectively minimizes interference from electrical noise, ensuring accurate signal acquisition.

• Flexible Connectivity: Multiple wiring options (terminal blocks, MIL cables, dedicated cables) provide versatility for different installation requirements.

• Broad Environmental Suitability: Options for extended temperature ranges and explosion protection make it suitable for a wide array of challenging industrial environments.

• Easy Maintenance: Its modular design facilitates easy replacement and troubleshooting.

• Seamless System Integration: Designed to integrate seamlessly with Yokogawa's control platforms (CENTUM VP, ProSafe-RS), leveraging their engineering tools and diagnostics.

Precautions

• Proper Wiring: Strictly follow the wiring diagrams provided in the Yokogawa manual. Ensure correct polarity for the external 24 V DC power supply and secure connections for input contacts.

• Clean Power Supply: Provide a stable and clean 24 V DC external power supply for the input wetting current. Fluctuations or noise in the supply can affect input detection.

• Earthing/Grounding: Proper earthing and shielding practices are essential to maintain signal integrity and noise immunity, especially in industrial environments.

• Environmental Limits: Ensure the module operates within its specified temperature and humidity ranges. If used in harsh environments, select the appropriate suffix code (e.g., for ISA G3 compliance or explosion protection).

• Hazardous Area Compliance: If the application is in a hazardous area, ensure the specific SDV144 model (with explosion protection suffix) and its installation adhere strictly to all relevant safety standards (e.g., ATEX, IECEx).

• Terminal Blocks/Cables: Use the correct and compatible terminal blocks (e.g., STB4S, STB4D) or signal cables (AKB331) as recommended by Yokogawa for proper functionality and withstand voltage.

• Dual Redundancy: If implementing dual redundancy, ensure both modules are identical in model and configuration, and that the system-level redundancy settings are correctly configured.

Product Applications

The Yokogawa SDV144 Digital Input Module is extensively used in various industries for monitoring discrete ON/OFF states and integrating them into complex control and safety systems.

• Oil & Gas (Upstream, Midstream, Downstream):

• Monitoring valve open/closed status, pump running/stopped indications.

• Detecting emergency shutdown (ESD) button presses, fire/gas detector alarms (via contact outputs).

• Monitoring safety interlocks on machinery.

• Chemical & Petrochemical:

• Status monitoring of process equipment (motors, pumps, agitators).

• Interlocking safety doors and guards.

• Detection of abnormal conditions via limit switches on tanks or vessels.

• Power Generation:

• Monitoring breaker status (open/closed).

• Detecting alarms from auxiliary equipment.

• Safety interlocks for turbine and boiler control systems.

• Water & Wastewater Treatment:

• Monitoring pump status, level switch alarms, filter backwash cycle indications.

• Status of motorized valves.

• Pharmaceutical Industry:

• Monitoring cleanroom door status, equipment operating modes.

• Interlocks for batch processing.

• Pulp & Paper:

• Monitoring machine states, conveyor belt status, and safety guards.

• General Manufacturing:

• Automation of production lines, assembly processes.

• Machine safety applications, material handling.

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