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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supplies factory-fresh Yokogawa SEC402-51 S1 communication modules, providing process automation engineers with a dependable, current-generation hardware source to maintain uninterrupted plant data exchange and reliable network redundancy.

        SEC402-51 S1

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        1001 reviews ｜ Need a Specific Revision?
        The YOKOGAWA SEC402-51 S1 is a dual-port ESB bus coupler module engineered for Yokogawa’s ProSafe-RS Safety Instrumented System (SIS) to achieve fast, fault-tolerant network communication.
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        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for SEC402-51 S1

        • Manufacturer:
          Yokogawa
        • Part Number:
          SEC402-51 S1
        • Product Family:
          Centum CS-Centum VP
        • Product Type:
          ESB Bus Coupler Module
        • Stock:
          1
        • Operating Voltage:
          5 VDC
        • Current Consumption:
          0.5 A
        • Transmission Bandwidth:
          128 Mbps (dedicated I/O data transmission)
        • Maximum Distance:
          10 meters per cable (Upper and Lower bus routes)
        • Internal Power Dissipation:
          2.5 Watts
        • Operating Ambient Temperature:
          0 to 60°C (32 to 140°F)
        • Storage Temperature Range:
          -20 to 85°C (-4 to 185°F)
        • Relative Ambient Humidity:
          10% to 90% RH (Non-condensing)
        • Weight:
          0.22 kg
        • Estimated shipping dimensions:
          3.2x12.8x13cm
        • Tariff Code:
          8537101190
        • Country of origin:
          Japan
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Applications Operating Environment Safety & Compliance

        Features:

        • High-Speed 128 Mbps Deterministic Transmission
        • Flexible Dual-Route Star & Line Architecture
        • Industrial-Grade ISA Standard G3 Protection
        The YOKOGAWA SEC402-51 S1 delivers an ultra-high bandwidth of 128 Mbps specifically optimized for distributed safety I/O processing. This guarantees sub-millisecond response times across the safety instrumented network, ensuring that emergency shutdown signals pass instantly without network jitter or packet loss under critical loads.

        Designed for complex network scaling, the YOKOGAWA SEC402-51 S1 facilitates up to 9 nodes per port under line layouts, and expands up to 12 nodes per port in star configurations. This allows process engineers to optimize physical plant layouts, reduce overall field cabling, and build large-scale distributed architectures.

        Featuring advanced G3 conformal coating, the YOKOGAWA SEC402-51 S1 is highly fortified against severe atmospheric conditions. It defends sensitive electronic components against airborne contaminants like hydrogen sulfide and sulfur dioxide, drastically extending the lifecycle of the safety system in heavy chemical environments.

        The SEC402-51 S1 YOKOGAWA ESB Bus Coupler Module (2-Port) still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        YOKOGAWA SEC402-51 S1 ESB Bus Coupler Module (2-Port) Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        YOKOGAWA SEC402-51 S1 ESB Bus Coupler Module (2-Port)

        General

        • Manufacturer YOKOGAWA
        • Model SEC402-51 S1
        • Condition New Original ready stock
        • Product Family SEC401-51 S3,SEC401-11 S3
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Petrochemical and Refining Complexes: Deployed inside Emergency Shutdown (ESD) architectures to maintain uninterrupted real-time communication between safety control hubs and distributed gas/fire detection nodes.
        • Offshore Oil and Gas Platforms: Used to interconnect safety nodes across highly isolated sections of offshore rigs, ensuring fail-safe execution of isolation and venting operations during pressure spikes.
        • Thermal and Nuclear Power Generation: Applied as a high-integrity communication interface for critical burner management systems (BMS) and turbine trip protections, prioritizing rapid sub-millisecond data execution.
        • Large-Scale Chemical Processing Plants: Implemented in hazardous reaction control setups where interlocks require high-speed data exchanges across corrosive atmospheres over distributed expansion racks.
        • Severe Corrosive Atmosphere Resistance: Tailored for locations with high chemical exposure, using advanced ISA G3 chemical coating to eliminate copper and silver corrosion caused by reactive sulfur or chlorine gases.
        • Industrial Thermal Tolerance: Engineered to operate efficiently within a standard industrial temperature range of 0°C to 60°C, absorbing minimal performance degradation even under intensive, sustained multi-node traffic processing.
        • High-Vibration Structural Integrity: Constructed with a ruggedized shell and solid metal connectors that meet rigorous industrial standards, resisting vibration-induced signal dropouts or mechanical wear inside control cabinets.
        • Optimized Low Heat Generation: Designed to draw a low current of only 0.5 A, which minimizes heat generation inside sealed enclosures, reducing cabinet cooling demands and extending adjacent module life.
        • SIL3 Functional Safety Compliance: Certified according to international IEC 61508 and IEC 61511 standards, guaranteeing that the module meets all performance requirements for safety integrity levels up to SIL3.
        • Strict Electromagnetic Compatibility (EMC): Fully compliant with global EMC directives, safeguarding the system from high-frequency electromagnetic fields, radio frequency interference, and heavy electrostatic discharges common to industrial settings.
        • Rigorous Manufacturing Quality Tracking: Manufactured by Yokogawa under strict ISO 9001 quality guidelines, with each Style S1 module undergoing full factory verification to ensure reliability before deployment.
        • Standard Industrial Explosion Protection Capability: While the suffix "-5" represents a standard non-explosion-proof design, its high isolation ratings allow it to be safely housed in standard purged enclosures within classified Zone 2/Div 2 areas.
        Description
        The YOKOGAWA SEC402-51 S1 provides a dedicated ESB bus master interface function designed to achieve seamless, deterministic I/O data transmission at speeds up to 128 Mbps. It eliminates network latency between safety control units and multi-node safety expansion networks, which is vital for emergency shutdown (ESD) applications.

        Equipped with two independent communication interfaces, the YOKOGAWA SEC402-51 S1 supports both standard dual-bus expansion and specialized star topologies. In standard configurations, it links up to 18 nodes (9 per port), while advancing to 24 units in star configurations (12 per port) with compatible safety control units.

        To withstand severe industrial atmospheres, the YOKOGAWA SEC402-51 S1 features standard ISA G3-compliant conformal coating. This chemical and moisture-resistant barrier prevents corrosive gas degradation, whisker growth, and dust accumulation, ensuring continuous mission-critical operation in chemical, oil, and gas plants.

        Engineered with meticulous mechanical tolerances, the YOKOGAWA SEC402-51 S1 installs directly into slots 7 and 8 of the S2SC70 or SSC60 safety control units. Its hardware architecture natively aligns with Yokogawa's dual-redundant safety protocols, eliminating single points of failure without requiring complex software configuration.
        Alternative Names
        SEC402 SEC402-5I SI SEC4O2-51 S1 SEC4O2-5I SI SEC401-51 S3 SEC401-11 S3
        Technical notes
        The YOKOGAWA SEC402-51 S1 must be dual-mounted on the designated 7th and 8th slots of the safety control unit (S2SC70 or SSC60) to facilitate proper redundant communication paths. System engineers must ensure that any interconnected upper or lower ESB bus cables do not exceed the maximum physical transmission distance of 10 meters per port.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What is the primary data bandwidth supported by the YOKOGAWA SEC402-51 S1, and how does it manage high I/O traffic?
        The YOKOGAWA SEC402-51 S1 natively supports a high-speed data transmission rate of 128 Mbps dedicated entirely to safety I/O module communication. It uses a deterministic hardware-driven protocol to prioritize time-critical safety signals, preventing packet collisions and maintaining fixed scan times even when the ProSafe-RS system is handling maximum I/O channel capacities.
        Which specific safety control units are compatible with the YOKOGAWA SEC402-51 S1, and what are its physical slot restrictions?
        The YOKOGAWA SEC402-51 S1 is engineered specifically for the ProSafe-RS platform and is fully compatible with safety control units like the S2SC70 and SSC60. To maintain system integrity and redundancy configurations, two YOKOGAWA SEC402-51 S1 modules must be mounted into the 7th and 8th slots of the safety control host chassis.
        How does the YOKOGAWA SEC402-51 S1 handle diagnostic depth and report communication faults to the host DCS/SIS?
        The YOKOGAWA SEC402-51 S1 features embedded, continuous self-diagnostics that track bus signal integrity across both the upper and lower ports. If an ESB bus cable is severed or suffers electromagnetic interference, the YOKOGAWA SEC402-51 S1 instantly triggers a hardware error flag, shifts the communication load to its redundant counterpart, and passes detailed diagnostic alerts to the Centum VP/ProSafe-RS management software.
        Can the YOKOGAWA SEC402-51 S1 be utilized for third-party Modbus or Ethernet/IP integrations?
        No, the YOKOGAWA SEC402-51 S1 is a dedicated internal system bus master interface module that operates on Yokogawa's proprietary ESB bus protocol. It cannot interface with third-party open networks directly. For Modbus, Profibus, or industrial Ethernet integration, separate communication modules must be deployed alongside the safety control unit.
        What are the exact physical distance limits and wiring constraints for installing the YOKOGAWA SEC402-51 S1?
        When installing the YOKOGAWA SEC402-51 S1, the maximum allowed cable distance is strictly 10 meters per port. This means the upper port ESB bus cable and the lower port ESB bus cable can each span up to a maximum length of 10 meters when linking the safety control unit to the safety node expansion units.
        What environmental conditions and chemical exposures is the YOKOGAWA SEC402-51 S1 certified to withstand?
        The YOKOGAWA SEC402-51 S1 is built to operate under standard 0 to 60°C temperature ranges and features an industrial-grade ISA Standard G3 conformal coating. This suffix code 1 designation confirms the YOKOGAWA SEC402-51 S1 can safely run in severe, humid atmospheres containing volatile gases, without risking premature component failure or corrosive short circuits.

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