Initial commissioning
4.3 Commissioning and operating redundant Links
IE/WSN-PA Link
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Compact Operating Instructions, 12/2012, A5E02509264-AD
The failover takes place within a maximum of 30 seconds. During this time, the WSN
remains established.
During a failover, a Modbus TCP connection can be interrupted which means that the
connection must be re-established by the Modbus TCP client.
Note
Data loss
During a failover, a maximum of 1 frame from each field device can be lost.
Management link for connecting the two redundant Links
The Ethernet cable with which the two redundant Links are interconnected at port 2 can be a
crossover or a straight-through cable. The Link detects this on port 2 with the autocrossover
function.
The connection between the two Links can run via a switch.
Note
No disconnection of the management link
After connecting the two redundant devices, the management link at port 2 of the two Links
must not be disconnected again.
Addressing of the redundant Links by the central control system
The two redundant Links are considered to be one device by the control system; in other
words, they are addressed with a single IP address.
Further protocols
STP or RSTP can be used in networks with redundant Links.
Commissioning and configuring redundant Links
With redundant Links, it is adequate if only one of the two links is configured. This is the
active device. The standby Link connected via port 2 adopts all the parameters from the
active Link.
Note
Initial commissioning of a WSN with redundant Links
During initial commissioning, allow the redundant Link adequate time to detect the field
devices and to set up the WSN. This can take up to half an hour and with very large
networks even up to one hour.
This means that the two Links also have the same IP address.
Summary of Contents for SIMATIC NET IE/WSN-PA Link
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Page 42: ...Zulassungen IE WSN PA Link 42 Kompaktbetriebsanleitung 12 2012 A5E02509264 AD ...
Page 44: ...Frequenzbereiche IE WSN PA Link 44 Kompaktbetriebsanleitung 12 2012 A5E02509264 AD ...
Page 46: ...Index IE WSN PA Link 46 Kompaktbetriebsanleitung 12 2012 A5E02509264 AD ...
Page 50: ...Table of contents IE WSN PA Link 50 Compact Operating Instructions 12 2012 A5E02509264 AD ...
Page 88: ...Approvals IE WSN PA Link 88 Compact Operating Instructions 12 2012 A5E02509264 AD ...
Page 90: ...Frequency ranges IE WSN PA Link 90 Compact Operating Instructions 12 2012 A5E02509264 AD ...
Page 92: ...Index IE WSN PA Link 92 Compact Operating Instructions 12 2012 A5E02509264 AD ...