After updating to StruxureWare Data Center Expert 7.5, the server loses communications with a monitored Symmetra Megawatt.

Issue:

Symmetra MegaWatt may lose Modbus communications with DCE after upgrading to StruxureWare 7.5

Product Line:

StruxureWare Data Center Expert
Symmetra MegaWatt

Environment:

Upgrade to StruxureWare DCE 7.5
Symmetra MW monitored via Modbus

Cause:

Due to the upgrade of StruxureWare DCE, the modbus DDF for the Symmetra MW is also updated to version 12. If the Symmetra is running older firmware, some registers may report off-line and StruxureWare may report this as the server being off-line. The same issue may occur in an older DCE revision if you update the DDF to the most recent version. Older firmware should be fine with version 11 of the DDF.

Resolution:

If you have upgraded to DCE 7.5 and see this issue, please look into updating the Symmetra MW firmware. The table below shows the affected firmware revisions when used with the new DDF. If you can not update the Symmetra and have already updated DCE or need to do so, please contact tech support and if allowed to remotely access the DCE server, can remove and replace the DDF causing the issue. This should not affect the EBS, only the UPS.
 

Symmetra Firmware	Highest Register	Highest DDF to use
3.0.1.157 3.1.0.124	Symmetra MW UPS (up to register 211), Symmetra MW EBS (up to register 92).	Version 11
3.2.0.112 3.2.0.210 3.2.1.105	Symmetra MW UPS (up to register 217), Symmetra MW EBS (up to register 102).	Version 11
3.3.0.121 3.3.1.105	Symmetra MW UPS (up to register 228), Symmetra MW EBS (up to register 102).	Version 11
3.4.0.142 3.4.0.145 3.5.0.118	Symmetra MW UPS (up to register 252), Symmetra MW EBS (up to register 117).	Version 11
3.4.2.107 3.5.1.104 3.5.2.101 3.5.3.106 3.5.4.108	Symmetra MW UPS (up to register 260), Symmetra MW EBS (up to register 126).	Version 11
3.5.5.110 3.5.5.112 3.5.6.108	Symmetra MW UPS (up to register 261), Symmetra MW EBS (up to register 126).	Version 11
3.5.7.111	Symmetra MW UPS (up to register 266), Symmetra MW EBS (up to register 126).	Version 11
3.5.8.103	Symmetra MW UPS (up to register 267), Symmetra MW EBS (up to register 126).	Version 11
3.5.9.118 3.5.9.118a	Symmetra MW UPS (up to register 271), Symmetra MW EBS (up to register 126).	Version 12
3.6.0.120 3.6.0.120a	Symmetra MW UPS (up to register 274), Symmetra MW EBS (up to register 129).	Version 12