L-Proxy User Manual
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LOYTEC
Version 3.1
LOYTEC electronics GmbH
input network variable on Node 2, which is waiting for updates. This use case is also
called active poll use case since L-Proxy actively polls the output network variable on
Node 1.
Node 1
Node 2
L-Proxy
Figure 50: Poll-Update use case (active poll).
6.1.5 Use Case Combinations
There can be combinations of the different use cases. An example where Update-Update
and Update-Poll are combined for one NV is shown in Figure 51. On the input side of
L-Proxy an output NV is bound to the input NV of L-Proxy. Updates are received
periodically. On the output side of L-Proxy an input network variable on Node 2 is bound
to the output NV on L-Proxy (Update-Update use case). Further, an OPC server polls the
same output NV periodically (Update-Poll use case).
Node 1
Node 2
L-Proxy
OPC
Figure 51: Combination of two basic use cases Update-Update and Update-Poll.
Another possible example for such a combination (Update-Update and Update-Poll) is
shown in Figure 52. This use case is a variation of the Update-Update use case. The only
difference is, that Node 2 does not wait for the first update to arrive after power-up or reset.
Rather, it polls for an initial value after it was started and waits for updates thereafter.
Node 1
Node 2
L-Proxy
Figure 52: Combination where Node 2 gets an initial value through polling.
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