SIMATIC PN/J1939 LINK
Operating Instructions, 12/2018, A5E45307564-AA
15
Functions
4
4.1
J1939 protocol
Extended CAN format
The J1939 protocol uses the Extended CAN Format CAN 2.0B (29-bit message ID).
The 29-bit message ID consists of the following:
Figure 4-1
29-bit message ID
●
Message priority. The priority of a message is used for the bus arbitration. The value 0
has the highest priority.
●
Parameter Group Number (PGN)
●
Address of the device that transmits the message.
Parameter Group Number (PGN)
A key element of the J1939 protocol is the Parameter Group Number (PGN). The type of a
message can be determined or recognized by means of the PGN.
Figure 4-2
Parameter Group Number (PGN)
User-specific PGN
Any combination of "PDU Format" and "PDU Specific" parameters is permitted for
configuration in the TIA Portal. Requirement: The combination is within the permissible value
range and not reserved for special purposes.
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