L-Proxy User Manual
52
LOYTEC
Version 3.1
LOYTEC electronics GmbH
6 Concepts
6.1 What is a Proxy?
Webster's Revised Unabridged Dictionary (1913) lists the following entries for
Proxy
:
Proxy \Prox"y\, n.; pl. Proxies. [Contr. from procuracy. Cf. Proctor.]
1. The agency for another who acts through the agent; authority to act for another, esp. to
vote in a legislative or corporate capacity.
2. The person who is substituted or deputed to act or vote for another.
3. A writing by which one person authorizes another to vote in his stead, as in a corporation
meeting.
The L-Proxy follows this definition. It acts on behalf of somebody else. For L-Proxy the
“somebody else” is another node in the network. As shown in Figure 46 the L-Proxy
hardware offers 3 physical network ports, two FT and one IP-852, which represent 5
individual nodes, one on each FT port and three on the IP-852 port. One can think of
L-Proxy as being 5 individual nodes that are somehow internally connected. Whenever an
input network variable on L-Proxy is being updated, L-Proxy updates a corresponding
output network variable. Also if a network variable poll is received on the output network
variable this poll can be forwarded to the input network variable. It doesn’t matter if the
output network is on the same node or on one of the other four nodes as the input network
variable. Since the 5 nodes can be configured in different domains, it is now possible to
bind network variables across domains.
Figure 46: L-Proxy offers five network ports, which represent 5 individual nodes.
We have listed use cases for L-Proxy that are typical in network installations. We use
these use cases to explain the fundamental operation of L-Proxy. Remember that input and
output network variables can reside on the same node or different nodes, in the same
domain or in different domains. The behavior of L-Proxy is always the same.
Summary of Contents for L-Proxy
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