Commissioning
Real-time Ethernet port multiplier48
Version: 2.6
4.2.7 Configuration: Ethernet/IP
Ethernet/IP is currently (2020) not supported.
4.3 Beckhoff EAP network variables
4.3.1 Introduction
Network variables are any variables that are cyclically exchanged between PC/CX1000 via TwinCAT.
Variables with any data types, including complex types, can be exchanged. The Publisher/Subscriber model
is used. For highly deterministic communication, the real-time Ethernet
driver for TwinCAT must be installed.
Publisher/Subscriber model
In the Publisher/Subscriber model, the Publisher makes variables available. Subscribers can subscribe to a
variable. The Publisher can make the variable available to a Subscriber, several Subscribers or all
Subscribers. In Broadcast mode the variable is made available to all PCs, in Multicast mode to selected PCs
and in Unicast mode only to one selected PC. A Subscriber can also be Publisher at the same time. In this
way, a bidirectional data link can be provided.
Fig.65: Publisher/Subscriber model
Unicast
The Publisher makes the network variable available to a single selected PC.
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General