CANbus Sniffer

The CANbus Sniffer enables you to monitor CANbus communications.

To use the Sniffer:

1. Create a Data Table dedicated to the CANbus Sniffer. To provide the column structure, select a CAN Sniffer struct.
   
   

2. Enable CANbus sniffer in PLC Communications> Physical> CANbus.

3. Link the dedicated Data Table.

4. Link a tag to control the CANbus Sniffer Operating Mode.

   Use these codes to activate the Sniffer in the desired mode: 0 - Disable Rx/Tx 1 - Enable Rx 2 - Enable Tx 3 - Enable Rx/Tx

 

The Sniffer writes data to the rows  sequentially. When the table is full, the Sniffer overwrites the rows.

The CAN Sniffer Struct provides the data shown below.

	Description
Time (ms)	Update interval
Identifier	This is the ID of the device being monitored
Type	Shows the CAN Identifier type: 0 = 11-bit (standard) 1 = 29-bit (extended)
Flags	The code shows the mode being monitored. 0 - Rx/Tx Disabled 1 - Rx Enabled 2-Tx Enable 3 - Rx/Tx Enabled
Data Size	Shows the number of data bytes that are being sent/received.
Data	This shows the data contents of the messages being sent/received
Occupied	This shows that the data table row contains data. The user must reset this bit.