Nidec Unidrive M700 - VLANs; Virtual Master; Parameter Update Rate

152 SI-Ethernet User Guide
Issue: 3
7.3.9 VLANs
To guarantee the timing of synchronous links VLANs must be enabled using VLAN Enable
(S.02.030). VLANs include a priority field that is applied to all messages. This field is used to apply
a higher priority to synchronous cyclic data than other non-deterministic traffic.
7.3.10 Virtual Master
It is possible to send cyclic data to devices on the network and use the same data on the
transmitting device. The cyclic links must be synchronous to include timing information. On the
transmitting device a receive link must also be configured with a matching link number to the
transmit link. For this link you must set Rx1 Source Type (S.10.044) to be Local. The Ethernet
interface will delay the usage of the data transmitted until the same point in time that all receiving
slaves will use the data.
7.3.11 Parameter Update Rate
Parameters are exchanged over the network. The value exchanged over the network must be
exchanged with the drive or option parameter. The rate of data exchange differs for synchronous
and non-synchronous cyclic links as well as for drive and option destinations.
The diagram below depicts the update cycles used within the Ethernet interface. Cyclic link
mappings being exchanged with the drive will be updated at the background task rate. This rate
(Background cycles per second (S.09.008)) varies with the load on the Ethernet interface;
EtherNet/IP data exchange also takes place in the background task.
Synchronous
Cyclic Links
Cyclic Links
Background
Task
500 µs
O
P
T
I
O
N
S
D
R
I
V
E
>=500 µs
Network
>=1 ms