The Yokogawa VC401-10 is a coupler module used within Yokogawa’s Vnet communication network for process control systems.

• Vnet Coupler: The “Vnet” designation indicates it’s designed for use with Yokogawa’s proprietary Vnet communication system. Vnet likely refers to a network protocol that allows various Yokogawa devices to communicate with each other.
• Coupler Module Functionality: Coupler modules generally serve two main purposes:
  • Signal Conditioning or Isolation: They might process or adjust signals for compatibility with other devices on the network. Additionally, they can isolate signals to prevent electrical noise or ground loops from affecting the system.
  • Interface Between Devices: Coupler modules can act as intermediate devices allowing connection between equipment using different communication protocols.