ProSoft Technology PLX81-EIP-61850 - Manual (Page 84)

Reference PLX8x-EIP-61850 ♦ Communication Gateway
User Manual Server to
IEC 61850 Client
Page 84 of 167 ProSoft Technology, Inc.
July 2, 2015
LED State Description
(Client) or on each receipt of data (server); so, if this condition exists,
it indicates a large number of errors are occurring in the application
(due to bad configuration) or on one or more ports (network
communication failures).
LED State Description
Data Off No activity on the Ethernet port.
Data Green Flash The Ethernet port is actively transmitting or receiving data.
Link Off No physical network connection is detected. No Ethernet
communication is possible. Check wiring and cables.
Link Green Solid Physical network connection detected. This LED must be on solid for
Ethernet communication to be possible.
5.4 Gateway
5.4.1 Asynchronous Processes
The gateway has a number of processes and drivers running in it in a
multitasking firmware environment. An IEC 61850 Client driver and an
EtherNet/IP driver operate asynchronously within this multitasking environment,
along with other firmware processes. The drivers are independently processing
the commands and messages in their queues as quickly as possible, giving
priority to GOOSE messages.
The EtherNet/IP driver processes data exchanges on the connections that have
been enabled at the configured RPI.
Meanwhile, the IEC 61850 Client may be receiving large amounts of data from
the configured IEDs. If so, the IEC 61850 Client updates the Tag Database with
data coming from the IEDs asynchronously from what’s happening with the EIP
driver.
Since the different drivers run asynchronously from each other and depending
upon how fast or how often IEDs send data, it is possible that a tag in the tag
database may be updated more than one time by the IEC 61850 Client driver
before the EtherNet/IP driver sees the update and can send the data to a PLC.
IED data changes are not buffered, so, the EtherNet/IP driver may not be able to
transfer every data change that happens in the IEC 61850 Client tag database.
Only the data most recently stored in the tag database by the IEC 61850 Client
driver is available for the EIP driver to transfer to EtherNet/IP device. So, it is
possible that some changes in data values on some IEDs may be lost in the
process, especially during times of high volume IED data traffic.