ABB CL Series, Applications Manual

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1SVC 440 795 M1100
6 CL-NET network, COM-LINK serial
connection
Introduction to CL-NET The CL-LDC.LN… display systems are provided with a
CL-NET network connection. This network is designed for
eight stations.
Using the CL-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 any station.
The CL-NET network is based on the CAN network
(Controller Area Network). CAN is specified in accordance
with the ISO 11898 standard. CAN has the following
standard 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 message system with message filtering on the
receiver.
• 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.
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CAN has been used as the basis for the design of the CL-NET
network. The messages have been adapted and optimised
to suit the requirements of the display system environment.