NOR-DNET parser problem

I use a card PCMCIA-CAN, series 1, first with NOR-DNET 1.6.2 and 1.6.3 now and I monitor traffic between an Allen Bradley SLC 5/04 with a scanner of DeviceNet 1747 - SDN.  The scanner MACID is 62, and the unit is MACID 1.  When I start it, I get normal Dest. Fields of MAC and the Description, as shown here:

If I click on the Red Square button 'stop', and then the green "run" button, I get the following results, with dashes in the two fields MACID if the source is 62 and go always in the Dest. field.  The description always says 'unknown '.  The PLC device and e/s continue to communicate normally during this period.

To clear this point-, I unplug the cable DeviceNet controller and plug in again - this always clears the problem and it starts showing the right data again.   Clues about what is happening?


This is an expected behavior in monitor OR DNET.

DeviceNet is a basic state machine Protocol. The parser need the message of setting up connection to know what a CAN ID is linked to a connection of IO.

Figure 1 works well because the parser also captures the message of establishment of connection and the following messages of e/s or EM. So, it can analyze a package type and detailed information.

Figure 2a of many "unknown" because the Analyzer only captures the following messages of e/s or EM without the connection message. (Notice: parser won't 'remember' the last message of setting up connection after a new 'start capture'.) It ensures that the state machine is supervised in a State of cleanliness).

The key to this question is always to capture the packets including the wiring diagram. The safest way so start to capture before your scanner DeviceNet starts to work.

NOR-DNET Analyzer supports the logging of large file. You can connect a large file and analyze the messages by filtration or research.

Tags: NI Products

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