CHAPTER 35
Network connection
405.1200.037.2 - Rel.: 2.21 of 25/02/2008
35-14
ESA-Net
All VT terminals can be connected in an ESA-Net network as
Network Cli-
ents
or as
Network Servers
(see technical characteristics of individual ter-
minals). The network Client can only ask other terminals in the network for
information (variables); while the network Server makes information (vari-
ables) available to other terminals in the network.
ESA-Net: VT
operation
To help clarify the concept of ESA-Net, we offer the data-flow diagram
below showing how a terminal assumes the function of client, server and
server/client.
In the ESA-Net network the server terminal is the one that makes all or
some of the variables available to the other terminals; these variables are
called
Public Variables
.
The maximum length of public objects is 60 Bytes; excess lengths
will be truncated. To avoid this, we suggest more than one object
with the appropriate lengths (with a length of 120 Bytes use two objects
of 60 Bytes).
D
VP
V
D
VP
V
1
2
3
8
7
6
5
4
MAX. 32
Participants
D
VP
V
D
VP
V
V
V
D
VP
V
Содержание VT130W
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