Problem Description:
The meter front display freezes and loses communication. Occasionally, it operates correctly for a period after a power cycle but then repeats the same issue.

Product Line:
Power Logic PM53XX (PM5320, PM5340, PM5341) series meter

Environment:
PM53XX meters connected in an IGMP protocol environment using a managed switch.

Cause:
The PM53XX Modbus TCP meter cannot handle IGMP multicast traffic, causing it to freeze when IGMP multicast traces reach the meter. This root cause can be identified by capturing network traces using Wireshark, as shown in the attached screenshot.



Resolution:
To prevent the PM53XX from freezing, enable IGMP snooping, which reduces multicast traffic and conserves bandwidth by reducing the amount of traffic that switches forward.

Note:
If the meter continues to freeze after enabling IGMP snooping, capture the Wireshark logs and contact Schneider Technical Support.

Đã phát hành cho: Schneider Electric Việt Nam