Description

Yokogawa ANT401-50/CU1T Optical ESB Bus Repeater Master Module

Configured for electrical-to-optical ESB bus signal conversion within CENTUM VP control architectures, the Yokogawa ANT401-50/CU1T (ANT401-50) Optical ESB Bus Repeater Master Module provides direct physical layer transport for Extended Serial Bus communication over fiber optic media up to 5 km when paired with compatible slave repeater units such as ANT502.

The module performs ESB bus signal regeneration, electrical isolation, and optical transmission using dual-core fiber links. It is designed for FCU and FIO Node Unit backplane integration with fixed-slot installation architecture and supports redundant configuration for dual-path ESB communication continuity.

Suffix Breakdown & Model Matrix

• ANT401: Optical ESB Bus Repeater Master Module series designation
• 50: 5 km transmission class configuration
• CU1T: Connector unit with built-in ESB bus termination function
• -5: Standard variant without explosion protection
• 0: Basic configuration type

Hardware Specifications

Parameter	Specification
Model / Brand	ANT401-50/CU1T / Yokogawa
Origin	Japan
Weight	Approx. 0.25 kg (main unit), ~2.0 kg shipping
Operating Temp	-20 degC to +60 degC
Power Consumption	24 VDC, approx. 0.5 A
Function	ESB bus electrical-to-optical conversion
Max Transmission Distance	Up to 5 km (fiber optic link, paired system)
Optical Interface	LC connector, 2-core Tx/Rx
Installation Base	FCU / FIO Node Unit slots (IO1-8 architecture)

Process Control Bus Signal Isolation and DCS Network Transport

The ANT401-50/CU1T implements ESB bus physical layer decoupling through optical conversion with inherent galvanic isolation between FCU backplane electrical domains and remote FIO node segments. In Yokogawa CENTUM VP architectures, ESB communication frames are regenerated at the master repeater stage, eliminating ground potential coupling across distributed node cabinets.

The optical transport path uses dual-channel fiber signaling with separate transmit and receive cores. Signal integrity is maintained through deterministic frame reconstruction at each repeater stage, ensuring stable backplane synchronization under multi-node expansion topologies.

Frequently Asked Questions

Q: Can the ANT401-50/CU1T operate in a hot-swap configuration?
A: Hot-swap capability depends on FCU baseplate implementation. The module itself interfaces via fixed backplane slots; removal typically requires ESB bus communication isolation at system level.

Q: What is the electrical load on the 24 VDC supply line?
A: The module draws approximately 0.5 A at 24 VDC under nominal operation, excluding inrush conditions during initialization.

Q: Is redundant fiber routing supported?
A: Redundancy is supported through paired master-slave repeater configuration and dual-path ESB topology; physical fiber redundancy depends on system design.

Field Installation Guidelines

• Install only in designated FCU or FIO Node Unit slots (IO1, 3, 5, 7 or paired redundant slots IO1-2, IO3-4, etc.)
• Maintain LC fiber connector cleanliness; avoid dust contamination during coupling cycles
• Ensure ESB bus termination is correctly configured using CU1T connector unit where required
• Route fiber optic cables with minimum bend radius compliant with industrial multimode fiber standards
• Maintain separation between optical fiber routing and high-noise power cabling to avoid EMI coupling at termination points
• Verify backplane slot alignment before insertion to prevent connector pin stress

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems