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The Yokogawa SNT401-53 is a Bus Repeater Module designed to extend communication distances and enhance signal integrity in industrial control networks. This module is primarily used in distributed control systems (DCS) and fieldbus networks to ensure reliable data transmission between devices by amplifying and regenerating signals across long distances or when multiple devices are connected.

SNT401-53 Mount a set of Optical ESB Bus Repeater Module for duplex on a pair of continuous slots. The module for ESB Bus1 is always mounted on a slot with odd number, and the module for ESB Bus 2 on a slot with even number.

SNT401-53 when mounting on SNT10D at 60 to 70 °C, leave two slots next to Power supply module and mount one set in every two slots, and leave two slots between one set SNT11. Unit for Optical Bus Repeater Module (SNT10D) is a unit to install Optical ESB Bus Repeater Modules. 

When combination of SNT401-53  and SNT501 and that of SNT411 and SNT511 are mixed and the length of cable for SNT401 and SNT501 is 5 km, the length of cable for SNT411 and SNT511 must be as long as 45 km (50 km – 5 km).

The SNT401-53 ESB bus transmission distance can be extended within the range of up to 50 km by connecting Optical ESB SNT401-53 Bus Repeater Master Module  at master side to N-ESB Bus Module  at slave side and N-ESB Bus Module (S2EN501) at master side to Optical ESB Bus Repeater Slave Module (SNT511) at slave side with an optical fiber cable.