Product Introduction
The Yokogawa ANT401-50/CU1T Optical ESB Bus Repeater Master Module is an industrial-grade communication interface designed to extend and stabilize ESB bus networks in Yokogawa distributed control systems. It converts electrical ESB signals into optical signals, enabling long-distance, high-integrity data transmission between field control units and remote node systems.
The “/CU1T” version integrates a connector unit with termination functionality, ensuring proper ESB bus signal stabilization at the network endpoint. This makes it particularly suitable for large-scale process plants where signal integrity, redundancy, and network reliability are critical.
Technical Specifications
| Parameter | Details |
|---|
| Manufacturer | Yokogawa |
| Model | ANT401-50/CU1T |
| Module Type | Optical ESB Bus Repeater Master Module |
| Function | ESB electrical-to-optical signal conversion |
| Communication System | ESB Bus (CENTUM / FCS architecture) |
| Transmission Distance | Up to 5 km (typical configuration) |
| Topology Support | Chain type / Star type |
| Max Chain Stages | 2 stages |
| Max Connections | Up to 8 paired modules (ANT401–ANT502) |
| Fiber Type | Single-mode optical fiber |
| Connector Type | LC optical connector |
| Current Consumption | ~0.5 A |
| Weight | Approx. 0.25 kg |
| Installation Location | Field Control Unit / Node Unit / Repeater Unit |
| Special Feature (/CU1T) | ESB bus termination integrated |
System Function Overview
The ANT401-50/CU1T acts as the master-side optical gateway in an ESB communication network. Its main responsibilities include:
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Converting ESB electrical signals into optical transmission
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Extending communication distance across large industrial facilities
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Stabilizing signal integrity in electrically noisy environments
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Providing proper bus termination for reliable data flow
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Supporting scalable distributed control system expansion
When paired with ANT502 slave modules, it forms a complete optical ESB communication backbone for Yokogawa DCS systems.
Key Advantages
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Extended Communication Range: Supports long-distance ESB transmission up to 5 km with stable performance
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High Noise Immunity: Optical transmission eliminates electromagnetic interference in industrial environments
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Integrated Bus Termination (/CU1T): Ensures clean signal reflection control and stable network performance
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Flexible Topology Design: Supports chain and star network structures for scalable architecture
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Industrial Reliability: Built for continuous operation in mission-critical process environments
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Compact Modular Design: Lightweight and easy to integrate into existing control cabinets
This combination makes it a trusted component in large-scale automation systems where communication stability directly impacts plant safety and efficiency.
Technical FAQs
1. What is the main function of ANT401-50/CU1T?
It converts ESB bus electrical signals into optical signals for long-distance transmission and provides bus termination.
2. What does /CU1T mean?
It indicates a connector unit with integrated termination for the ESB bus.
3. What is the maximum transmission distance?
Up to 5 km depending on system configuration and fiber quality.
4. What systems is it used with?
Yokogawa CENTUM VP and related FCS/DCS architectures.
5. How many modules can be connected?
Up to 8 paired ANT401–ANT502 modules in supported configurations.
6. What type of fiber is required?
Single-mode optical fiber with LC connectors.
7. What is the installation environment?
Field control units, node units, and optical repeater systems.
8. Why is optical conversion important?
It improves signal stability and eliminates electromagnetic interference.
9. Does it support redundancy?
Yes, it can be used in redundant network configurations.
10. What industries commonly use it?
Oil & gas, petrochemical, power generation, and large-scale process automation plants.
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