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ifm
System Manual
ecomat
mobile
PDM360NG (CR1080, CR1081, CR9042) Target V01
2011-07-28
CAN in the PDM360
CAN units acc. to SAE J1939
207
9.5
CAN units acc. to SAE J1939
CAN for the drive engineering................................................................................................... 207
Units for J1939 (management).................................................................................................. 212
Units for J1939 (send)............................................................................................................... 222
Units for J1939 (receive) ........................................................................................................... 233
7482
The network protocol SAE J1939 describes the communication on a CAN bus in utility vehicles for
submitting diagnosis data (e.g. engine speed, temperature) and control information.
9.5.1
CAN for the drive engineering
Identifier acc. to SAE J1939...................................................................................................... 208
Example: detailed message documentation ............................................................................. 209
Example: short message documentation.................................................................................. 210
Limitations of the devices (SAE J1939) .................................................................................... 211
7678
With the standard SAE J1939 the CiA bietet offers to the user a CAN bus protocol for the drive
engineering. For this protocol the CAN controller of the 2nd interface is switched to the "extended
mode". This means that the CAN messages are transferred with a 29-bit identifier. Due to the longer
identifier numerous messages can be directly assigned to the identifier.
For writing the protocol this advantage was used and certain messages were combined in ID groups.
The ID assignment is specified in the standards SAE J1939 and ISO 11992. The protocol of
ISO 11992 is based on the protocol of SAE J1939.
Standard
Application area
SAE J1939
Drive management
ISO 11992
"Truck & Trailer Interface"
The 29-bit identifier consists of two parts:
- an 11-bit ID and
- an 18-bit ID.
As for the software protocol the two standards do not differ because ISO 11992 is based on
SAE J1939. Concerning the hardware interface, however, there is one difference: higher voltage level
for ISO 11992.
NOTE
To use the functions to SAE J1939 the protocol description of the aggregate manufacturer (e.g. for
engines, gears) is definitely needed. For the messages implemented in the aggregate control device
this description must be used because not every manufacturer implements all messages or
implementation is not useful for all aggregates.