Product Overview
YOKOGAWA SEC402-51 ESB Bus Coupler Module
SEC402-51
The YOKOGAWA SEC402-51 is a 2-port ESB bus coupler module designed for Yokogawa ProSafe-RS safety instrumented systems. It delivers reliable high-speed dual-bus data transmission between safety control units and safety node units in critical industrial environments.
Product Overview
The YOKOGAWA SEC402-51 is an advanced 2-port ESB Bus Coupler Module engineered specifically for the Yokogawa ProSafe-RS safety instrumented system architecture. As a critical communication master interface, the SEC402-51 connects safety control units (such as S2SC70 or SSC60) and remote safety node units via both upper and lower ESB bus cables. Designed to meet strict safety and operational standards, this 2-port module ensures fault-tolerant, uninterrupted data exchange in high-stakes automation environments.
Key Features & Highlights
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ProSafe-RS Safety Integration: Built exclusively for integration within Yokogawa ProSafe-RS safety control architectures, ensuring flawless system compatibility.
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Dual-Port 2-Bus Architecture: Features dual-port support (upper and lower ESB bus connections) for expanded node unit capacity and flexible network topologies.
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High-Speed Data Transmission: Operates at a robust 128 Mbps transmission speed to manage I/O module data transfer efficiently without latency.
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Expanded Unit Capacity: Supports connection of up to 9 safety node units per port (or up to 12 units under specific star connection configurations), optimizing system scalability.
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Compact Footprint: Features space-saving physical dimensions (approx. 32.8 mm width) optimized for installation in designated safety control unit slots (seventh and eighth slots).
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Rugged Industrial Reliability: Operates reliably with low current consumption (0.5 A) and an ultra-lightweight form factor of approximately 0.24 kg, minimizing stress on control system backplanes.
Functional Architecture
The SEC402-51 mounts directly onto the designated seventh and eighth slots of compatible safety control units. It utilizes specialized ESB bus cables to maintain secure communication loops across upper and lower ports, ensuring high availability and system redundancy in process safety applications.
Application
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Oil & Gas Refineries: Emergency shutdown systems (ESD) and fire & gas (F&G) monitoring networks.
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Petrochemical & Chemical Plants: High-integrity pressure, flow, and temperature safety protection loops.
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Power Generation Facilities: Boiler safety interlocks and turbine emergency trip control systems.
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Offshore Platforms: Critical process safety control and hazardous area monitoring infrastructure.
Technical Specifications
| Item / Feature | Specification Details |
| Model Code | SEC402-51 (ESB Bus Coupler Module for 2-Port) |
| Suffix Codes | -5 (Standard type with no explosion protection), 1 (With ISA Standard G3 coating) |
| System Compatibility | ProSafe-RS Safety Instrumented System |
| Module Function | ESB bus master interface function (2-Port) |
| Connectable Units | Max. 9 units on upper side, Max. 9 units on lower side (up to 12 units for specific star configurations) |
| Transmission Speed | 128 Mbps (I/O module data transmission) |
| Transmission Distance | 10 m maximum per ESB bus cable |
| Current Consumption | 0.5 A |
| Weight | Approx. 0.24 kg |
| Dimensions (W x H x D) | Approx. 32.8 mm x 130 mm x 129.5 mm |
| Mounting Slot | Seventh and eighth slots of the safety control unit |
FAQ
Q1: What is the main difference between SEC401 and SEC402 modules?
A: The SEC401 is designed for standard single-port ESB bus coupling, whereas the SEC402-51 is a 2-Port ESB bus coupler module that supports both upper and lower port connections for expanded redundancy and node capacity.
Q2: How many safety node units can be connected to the SEC402-51?
A: It supports up to 9 safety node units on the upper side and up to 9 units on the lower side under standard configurations (and up to 12 units per side under specific star connection setups).
Q3: Which safety control units are compatible with the SEC402-51?
A: It is designed to be mounted on the seventh and eighth slots of compatible Yokogawa safety control units such as S2SC70 and SSC60.
Q4: What is the data transmission speed of the SEC402-51 module?
A: The module supports an I/O module data transmission speed of 128 Mbps over a maximum transmission distance of 10 meters per ESB bus cable.
Product documents
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