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BasicController CR0403
Function elements: SAE J1939 request
Content
35704
142
BasicController CR0403
J1939_SPEC_REQ
= J1939 Specific Request
Unit type = function block (FB)
Unit is contained in the library ifm_J1939_NT_Vxxyyzz.LIB
Symbol in CODESYS:
35253
>
Description
J1939_SPECIFIC_REQUEST requests and receives a specific message from another controller.
>
If a multiframe message is requested:
• the FB provides the first 8 bytes of the data
• RESULT indicates an error
Parameters of the inputs
35321
35083
Parameter
EXECUTE
CHANNEL
PGN
Data type
BOOL := FALSE
BYTE
DWORD
BYTE
Description
FALSE TRUE (edge): execute function element once otherwise: function element is not active
A function element already started is processed.
CAN interface (1...n) depending on the device
PGN = Parameter Group Number permissible = 0...262 143 = 0x00000000...0x0003FFFF
J1939 address of the requested device
>
DA
Parameters of the outputs
35206
Parameter
PRIO
LEN
DATA
RESULT
Data type
BYTE
WORD
ARRAY [0..7] OF BYTE
BYTE
Description message priority (0…7) number of the bytes received (0...8) received data, (1...8 bytes) feedback of the function block
(possible messages → following table)
Possible results for RESULT:
Value dec | hex
Description
0
1
5
64
242
00
01
05
40
F2
FB is inactive
FB execution completed without error – data is valid
FB is active – no data received yet
Error: receive multiframe
Error: setting is not possible
143
BasicController CR0403
J1939_SPEC_REQ_MULTI
= J1939 Specific Request Multiframe Message
Unit type = function block (FB)
Unit is contained in the library ifm_J1939_NT_Vxxyyzz.LIB
Symbol in CODESYS:
35256
>
Description
>
J1939_SPECIFIC_REQUEST requests and receives a specific multiframe message from another controller.
35315
Parameters of the inputs
35082
Parameter
EXECUTE
CHANNEL
PGN
Data type
BOOL := FALSE
BYTE
DWORD
BYTE
Description
FALSE TRUE (edge): execute function element once otherwise: function element is not active
A function element already started is processed.
CAN interface (1...n) depending on the device
PGN = Parameter Group Number permissible = 0...262 143 = 0x00000000...0x0003FFFF
J1939 address of the requested device
>
DA
Parameters of the outputs
35183
Parameter
PRIO
LEN
DATA
RESULT
Data type
BYTE
WORD
ARRAY [0..1784] OF BYTE
BYTE
Description message priority (0…7) number of data bytes to be transmitted allowed = 1...1 785 = 0x0001...0x06F9
Received data (1...1785 bytes) feedback of the function block
(possible messages → following table)
Possible results for RESULT:
Value dec | hex
Description
0
1
5
242
00
01
05
F2
FB is inactive
FB execution completed without error – data is valid
FB is active – no data received yet
Error: setting is not possible
144
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