Hot Connect - WAGO I/O-SYSTEM 750 Manual

116 Function Description
7.6

Hot Connect

Hot Connect is a feature of the EtherCAT
preconfigured areas of the network – so-called Hot Connect groups – to the
EtherCAT
cation from the master to other slaves. Hot Connect works both before starting
and during the operation. A "Hot Connect" group can consist of multiple slave or
a single slave.
Although star topology is best suited for this functionality, Hot Connect can be
used in any network topology.
The advantages of the applications include:
• Connecting or disconnecting slaves or slave groups (drives, I/O modules,
sensors, position sensors) in a modular production line
• High availability of the network in the event of a subscriber or group failure
• Protection against transposing identical slaves (e.g., drives)
The slave must have an "Explicit Device ID" to be Hot Connect capable.
The ID is set locally on the slave and allows unique identification of the slave in
the network. Identification of a slave via the identify object (0x1018) is not enough
to distinguish the same item from one manufacture in the network if there are
multiple slaves of the same type or from the same manufacture in the network.
Difference between "Explicit Device ID" and "Physical Addressing"
Identification via the "Explicit Device ID" should not be confused with slave
addressing. And EtherCAT
physically addressing the slave.
Some masters can use "Configured Station Alias" for physical addressing. In
such case, the "Explicit Device ID" can be used as the physical address via the
"Configured Station Alias" method.
There are currently four methods by which the "Explicit Device ID" can be read by
the master:
• "Requesting ID" method
• "Direct ID" method
• "Configured Station Alias" method
• "Legacy Mode" method
However, the "Legacy Mode" method is no longer recommended due to its error
rate.
The name of the respective method can vary from master to master.
How these methods work is described in detail in the EtherCAT
(ETG.1020).
Which method the respective EtherCAT
WAGO slaves support the "Requesting ID" method recommended by ETG.
What the method is actually called in the respective master is specified in the
Manual
Version 1.2.1
750-354/000-001 EtherCAT® Fieldbus Coupler, ID Switch
®
network and to disconnect without any effect on existing communi-
®
master never uses the "Explicit Device ID" for
WAGO-I/O-SYSTEM 750
®
technology that allows you to connect
®
slave supports is defined in the ESI file.
®
specification