Product Description

Overview
The SSB401-53 by Yokogawa is a high-performance Vnet/IP Interface Module for the CENTUM VP Distributed Control System (DCS). It acts as a dedicated bridge between control stations or HMIs and the Vnet/IP network, ensuring high-speed, deterministic communication. The module supports dual-redundancy and operates in demanding industrial environments thanks to its -53 hardware variant, often including conformal coating for protection against moisture, corrosive gases, and dust.

Paired with this, the Optical ESB Repeater Module extends the ESB Bus signal over optical fiber, connecting the SNT411 Master and SNT511 Slave modules. This allows signal transmission distances of up to 50 km with minimal signal attenuation, ensuring reliable communication between remote safety and I/O nodes.

Key Features

SSB401-53 Vnet/IP Interface

• Dual-redundant ports for Bus 1 and Bus 2 connectivity

• 1 Gbps deterministic Ethernet optimized for control traffic

• Real-time communication with minimal jitter (<1 ms) for alarms and process data

• Front-panel LEDs indicate link status, network activity, and module health

• Built-in self-test and continuous diagnostics for rapid troubleshooting

• G3 Conformal Coating (-53 variant) protects against corrosive environments

Optical ESB Repeater Module

• Converts ESB Bus signals to optical format for long-distance transmission

• Supports both star and chain topology connections

• Maximum two connecting stages, total distance up to 50 km

• Optical power attenuation 3–4 dB; attenuators recommended if below 3 dB

• Low power consumption (~0.5 A) and lightweight (~0.3 kg)

• Maintains signal integrity between safety control units, safety node units, and NIO nodes

Technical Specifications

Applications

• High-speed control networks in chemical plants, refineries, and power generation

• Long-distance signal transmission for safety and I/O nodes

• Redundant network configurations for CENTUM VP and ProSafe-RS

• Industrial installations requiring G3-rated hardware for corrosive environments

FAQ

Q: What is the main purpose of the SSB401-53?
A: It provides deterministic, high-speed Vnet/IP connectivity between control stations or HMIs and the CENTUM VP network, supporting dual-redundancy for uninterrupted process control.

Q: How does the Optical ESB Repeater extend network distance?
A: By converting ESB Bus signals to optical signals, it connects master and slave nodes over fiber, extending reliable communication up to 50 km.

Q: Can the SSB401-53 handle harsh environments?
A: Yes, the -53 variant includes G3 conformal coating for protection against moisture, corrosive gases, and industrial contaminants.

Q: Are these modules compatible with safety-critical networks?
A: Absolutely. Both modules are designed to maintain signal integrity and reliability for critical safety and control applications.