Siemens SIMATIC PN/J1939 LINK Operating Instructions Manual page 23

Parameter name
PGN data length
SIMATIC PN/J1939 LINK
Operating Instructions, 12/2018, A5E45307564-AA
Module name Value range
PGN input n bytes 8 to 512
PGN output n bytes
PGN input proxy 8 to 1785
PGN output proxy
4.2 PGN parameters
Description
PGN modules with specified data
lengths from 8 bytes to a maximum of
512 bytes are available.
If the value for the PGN data length
differs from the maximum module data
length, the difference in bytes is truncat-
ed from the PGN message.
Example:
You want to send 20 bytes of data. For
this purpose, you select a PGN output
module with a predefined size of 32
bytes. You specify 20 bytes as the PGN
data length.
Only these 20 bytes are transferred via
the CAN network. The remaining 12
bytes are truncated.
Specification of the maximum PGN
message length. The corresponding
data must be read with the data record
index 0x220.
Specification of the maximum PGN
message length. The corresponding
data must be written with the data record
index 0x230.
Functions
21