Yokogawa ANT401‑50 Optical ESB Bus Repeater Module, 5km Fiber Extension Master Unit for CENTUM VP FIO/N‑IO DCS Network Expansion

Yokogawa ANT401‑50 5km Optical ESB Bus Master Repeater Module for Long-Distance DCS Network Extension

1. ESB Electrical-to-Optical Signal Conversion & 5km Long-Range Transmission

The ANT401‑50 serves as the master core of Yokogawa’s short-range optical bus extension solution, dedicated to converting standard electrical ESB bus signals into optical fiber signals. It effectively breaks the 10-meter limit of conventional copper-based ESB communication, extending reliable DCS bus transmission distance up to 5 km. Paired with slave-side ANT502 modules, it builds complete long-distance field control links for widely distributed plant equipment.

Maintaining full ESB bus communication accuracy and real-time performance, the module ensures zero data loss and negligible latency during signal conversion and long-distance transmission. It perfectly adapts to large-scale factories with scattered FCS racks, remote I/O cabinets and distributed process units.

2. Flexible Network Topology & Bus Termination Options

Supporting multiple industrial network architectures, ANT401‑50 accommodates chain, star and hybrid topological layouts, delivering high flexibility for customized DCS network design. It provides two professional on-site wiring options: standard connector units for regular bus connection and terminator-equipped connector units for precise ESB bus terminal signal termination, eliminating signal reflection and transmission interference.

The master-module positioning allows centralized network scheduling and stable signal interaction with multiple slave repeater nodes. This structural advantage simplifies hierarchical bus deployment for large-area workshop control systems and reduces network layout complexity.

3. Industrial-Grade Anti-Interference & Environmental Adaptability

Fiber-based transmission fundamentally eliminates common industrial interference issues including electromagnetic coupling, ground loop potential difference and on-site radiation noise. Compared with traditional copper bus cables, ANT401‑50 optical extension greatly improves EMC stability, ensuring consistent communication quality in high-electromagnetic-interference environments such as chemical, petrochemical and power plants.

Designed for 24/7 continuous industrial operation, the module supports wide ambient temperature adaptation and stable operation under 5%–95% non-condensing humidity. Compact lightweight structure and vibration-resistant design adapt to long-term cabinet operation and complex on-site industrial conditions, lowering daily network failure rates.

4. Native CENTUM VP System & FIO/N‑IO Compatibility

ANT401‑50 features native compatibility with CENTUM VP DCS platforms, fully matching FIO and N-IO system rack specifications. It supports seamless docking with mainstream AFV30/AFV40 series FCS units, requiring no system firmware modification or additional configuration. Plug-and-play deployment simplifies new project network construction and old system long-distance bus renovation.

As a dedicated short-distance optical extension unit, it forms a differentiated matching system with long-range 50km-grade ANT411 modules, covering full-range DCS bus distance expansion requirements for different plant scales.

5. Application Scenarios & Core Competitive Advantages

Application Scenarios: Ideal for large process industries with scattered control cabinets and long transmission distances, including petrochemical, thermal power and chemical manufacturing. Widely used for remote FIO/N-IO rack extension, cross-workshop ESB bus connection and distributed field control network integration.

Core Advantages: 5km ultra-long fiber transmission breaks copper ESB distance limits; photoelectric isolation enhances network anti-interference and operational stability; flexible multi-topology design adapts to diverse plant layouts; master-slave matching architecture ensures standardized bus expansion; full CENTUM VP compatibility reduces project transformation and deployment costs.