Control Network Vnet/IP

In 2004, Yokogawa introduced the Vnet/IP control network for production control systems.

Achilles Level 1+ Robustness Against Cyber Attack Yokogawa has received Achilles Level 1+ certification for Vnet/IP controllers.
 

What is Required in a Control Network?

Our users require the ability to incorporate commercially available communication devices in their network systems while maintaining the high reliability, real-time control capability, and stable communications that are the hallmarks of conventional control networks.

• The aim is not just to benefit from general-purpose technologies, but to create a common platform that can connect with a variety of equipment.

Users are looking to reduce network configuration costs by utilizing the latest commercially available network equipment.

• A wider selection of communications media must be available and network configuration must be more flexible.
  

Control Network Innovation (Vnet/IP)

A new control network protocol that incorporates general communication functions and enables highly reliable, real-time, and stable communications is now available.

• Name: Vnet/IP
  This new control network protocol is called Vnet/IP because it is compatible with Vnet and used the IP Internet protocol for general-purpose communications.
• Vnet/IP is a 1-Gbps control network that is functionally compatible with V net and is based on the Ethernet protocol.
• The Vnet/IP control network conforms to CPF-10 of the Real-Time Ethernet(RTE) communication profile defined in IEC 61784-2.
  

How Does Vnet/IP Compare to V net?

Vnet/IP has all the advantages of V net, which remains an excellent control network, while offering substantially higher throughput.

• Compatibility
  Supports V net-compatible protocols and incorporates all V net communications functions
• Reliability (Redundant bus configuration)
  Features a robust redundant configuration that switches buses quickly in event of failure - equivalent to V net
• Performance
  Response times are equivalent to V net’s, but throughput is up to ten times greater, depending on the performance of the communications station.
  

Reliability (functional compatibility)

Vnet/IP incorporates all current V net services.

Performance

• Same fast response times of V net
• Throughput approximately ten times greater(*) than V net
• Monitoring of station status (updating live list) at 1-second intervals, same as with V net
• Time synchronization accuracy of 1 millisecond within the same domain

• Note:(*)The actual throughput depends on the performance of the communication station.