1 Technical Description, Installation Guidelines, Operation
30
IE/AS
−
INTERFACE LINK PN IO
as of hardware version 1, as of firmware version V2.0
Release 08/2018
C79000
−
G8976
−
C216
−
03
The IE/AS-i LINK PN IO is designed for operating on PROFINET networks where
the configured participants are connected and communicate error-free. It is
imperative to prevent high levels of broadcast or multicast communication on the
PROFINET network.
1.1
1
Restrictions due to broadcast or multicast communication
Notice
If the level of broadcast or multicast communication is too high, the Ethernet
interface of the IE/AS-i LINK can become overloaded, resulting in data
transmission delays, or even device failure.
Broadcast or multicast communication arises when the PROFINET controller is
looking for PROFINET nodes, for example. The search is periodically repeated,
especially when configured PROFINET nodes are not available on the PROFINET
network. Depending on the PROFINET controller and its settings, it is possible that
the communication cycle time is subject to significant fluctuations.
This scenario can occur during step-by-step commissioning of a PROFINET
network. Broadcast or multicast communication can be reduced by adapting the
network configuration to the actual design, e.g. via STEP 7 hardware configuration
or by calling the SFC "D_ACT_DP" SIMATIC system function (Deactivate/activate
distributed I/O devices; SFC 12) in the user program.
Distributing the PROFINET or Ethernet nodes into separate networks can also
reduce broadcast or multicast communication.
Broadcast or multicast communication usually also arises when other network
devices such as computers or PCs are connected to the Ethernet network.
Using SCALANCE managed Industrial Ethernet switches also makes it possible to
limit broadcast or multicast communication at the IE/AS-i Link by filtering Ethernet
communication.
