User Manual

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08/04 AWB2528-1423GB
5easy-NET network
Introduction to easy-NET All easy800 units have an easy-NET network interface
connection. This network is designed for eight stations.
Using the easy-NET you can:
• Process additional inputs and outputs.
• Implement faster and improved control using
decentralised programs.
• Synchronise date and time
• Read and write inputs and outputs.
• Send values to other stations.
• Receive values from other stations.
• Load programs from or to other stations.
The easy-NET network is based on the CAN network
(Controller Area Network). CAN is specified by the
ISO 11898 standard. CAN has the following in-built
features:
• Message oriented transmission protocol.
• Multimaster bus access capabilities with non-destructive
bitwise bus arbitration via priority messaging (Arbitration:
An instance which defines which hardware can use the
bus next).
• Multicast broadcast messaging with receiver side message
filtering.
• High level of real-time capability (short reaction time for
high priority messages, short fault message get times).
• Functionality in environments with severe interference
(short block lengths).
• High level of error security.
h
CAN has been used as the basis for the design of the
easy-NET network. The messages have been adapted and
optimised to suit the requirements of the easy800
environment.