Advantech ADAM-5000/ECAT handleiding
Handleiding
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Figure 1.3 EtherCAT Topology
Inexpensive industrial Ethernet cable can be used between two nodes up to 100m
apart in 100BASE-TX mode. EtherCAT makes a pure bus or line topology with
hundreds of nodes possible without the limitations. Up to 65,535 devices can be
connected to EtherCAT, so network expansion is almost unlimited.
EtherCAT protocol supports individual nodes to be connected and disconnected during
operation. If one of slaves in network is removed, the rest of the network can continue
to operate normally. Additionally, EtherCAT also enables other communication features
such as cable redundancy or even master redundancy with Hot Standby.
Synchronization
Distributed Clocks (DC) mechanism is used to provide highly precise time
synchronization between slaves in an EtherCAT network, which is equivalent to the
IEEE 1588 Precision Time Protocol standard. By using distributed clocks, EtherCAT is
able to synchronize the time in all local bus devices within a very narrow tolerance
range. All EtherCAT slaves are provided with an internal clock which named as System
Time (t
Local Time
). One EtherCAT Slave, usually the first slave, will be used as a
Reference Clock and distributes its Clock cyclically.
Possible misalignments between the reference clock and the clocks of the other slaves
are usually due to the following reason: when a slave is switched on, the internal
free-running register that holds the current time is reset to zero. Unfortunately, this
action does not take place exactly at the same time in all the different slaves, and this
result in an initial offset (t
offset
) among clocks that has to be compensated.
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Productinformatie
| Merk | Advantech |
| Model | ADAM-5000/ECAT |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 22504 MB |
