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VARAN-Bus Basics
With the VARAN bus, the requirements for hard real time
control are combined with those for automation and implemented
Ethernet technology. The bus is based on IEEE 802.3 100TX
standard Ethernet and the protocol is executed completely
in the hardware.
To take advantage of existing networks, TCP/IP cross traffic
is integrated. The technology is open and can be used by
anyone. Collisions are avoided through the manager-client
principle. The entire bus is treated as a 4GB memory space
in which each client is assigned a defined memory range.
The control CPU can then access the connected participants
with simple read/write instructions.
VARAN also offers another unique feature; asynchronous direct
access. Data packets can be resent within a data cycle until
a valid confirmation is received. Therefore all data is valid
at the end of a cycle.
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