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The Optical ESB Bus Repeater Module converts ESB Bus, which connects among safety control unit, safety node unit and N-IO node, to optical signal. ESB Bus transmission distance can be extended by connecting Optical ESB Bus Repeater Master Module (SNT411) and Optical ESB Bus Repeater Slave Module (SNT511) with an optical fiber cable. The ESB bus transmission distance can be extended within the range of up to 50 km by connecting Optical ESB Bus Repeater Master Module (SNT411) at master side to N-ESB Bus Module (S2EN501) 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. l SNT411 Optical ESB Bus Repeater Master Module This module is connected from ESB Bus Coupler Module (SEC401, SEC402) on the safety control unit or ESB Bus Interface Module (SSB401) on the safety node unit (SNB10D) through ESB Bus cable. There are two types of ESB Bus Repeater Modules: with or without a terminator. l SNT511 Optical ESB Bus Repeater Slave Module This module is connected from Optical ESB Bus Repeater Master Module or N-ESB Bus Module through fiber-optic cable. Furthermore, it is connected through ESB Bus cable to ESB Bus Interface Module (SSB401) on the safety node unit (SNB10D).