PLCs, Power Supplies & Others

Reliable Optical Extension for CENTUM Remote I/O

The Yokogawa SNT501-13 functions as an optical ESB bus repeater slave module for the CENTUM VP and CS3000 platforms. This module receives optical signals from the master repeater and converts them back to electrical ESB bus signals . It enables communication between the controller and remote I/O nodes over extended distances . The SNT501-13 supports a maximum transmission distance of 2 km using multimode optical fiber . Its compact design fits seamlessly into remote I/O cabinets for distributed control architectures.

Signal Conversion and Diagnostic Features

The module incorporates two optical ports (850 nm wavelength) for receiving and forwarding optical signals. It automatically synchronizes with the master module’s transmission timing to ensure error‑free data exchange . The SNT501-13 provides diagnostic LEDs that indicate optical link status and bus activity . The module’s optical interface provides galvanic isolation, eliminating ground loop and interference issues . Furthermore, this slave module supports daisy‑chain connections for flexible network layouts.

Technical Specifications

Installation and System Integration

You can install the SNT501-13 in any remote I/O cabinet within the CENTUM architecture . The module connects directly to the optical fiber network and requires minimal configuration . Its optical isolation protects the control system from electrical noise and voltage differences . This module works in conjunction with the master repeater module SNT411-13 to form complete optical ESB bus networks . Consequently, engineers select the SNT501-13 for reliable remote I/O communication in large‑scale petrochemical, power, and water treatment plants.

Details