Mitsubishi Electric MELSEC-F FX3U-J1939 User Manual page 64

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FX
-J1939 User's Manual
3U
Remote transmission request
The CAN standard defines a service to request certain information from the network. Upon reception of this
kind of request, every node checks if it is the producer of the requested information. The producer node of the
requested data will respond with the desired data.
The request differs between Layer 2 and J1939 mode.
Function Mode
J1939 communication mode
Layer 2 communication
mode
Manual/PLC transmission trigger
The transmission of any configured transmit message can be triggered by setting the corresponding bit in
BFM #1280 to #1284.
Transmission Type K0 and K1
Transmission type K0 and K1 are controlled by BFM #20 bit 0.
• Transmission type = K0
When BFM #20 bit 0 is set to ON, the message is always transmitted.
• Transmission type = K1
When BFM #20 bit 0 is set to ON, the message is transmitted. However, if data has not been changed, it is
not transmitted.
BFM #25 bit 4
Configuration mode
BFM #20 bit 0
BFM #100 to #103
Data
Data message 1
(internal)
Transmission
Type K0
Transmission
Type K1
54
Remote Transmit Request Format
SAE J1939 defines the PGN 59904 for remote transmit
requests. The request message contains 3 data bytes with the
requested PGN (low byte first). If the requested PGN is
configured as a transmit message of the FX
module will respond with a data frame.
The remote transmit request flag in the CAN message is set,
and the CAN-ID of the message matches exactly with the ID of
one of the FX
-J1939 configured transmit message IDs.
3U
H0000
H5555
H0000
H0000
H0000
6.2 [BFM #500 to #973] Configuration Area
-J1939, the
3U
Online mode
HAAAA
H5555
H5555
H5555
H5555
HAAAA
H5555
HAAAA
6 J1939 Communication Mode
Applies To
All configured transmit PGNs.
A maximum of 28 transmit messages
with enabled auto or manual RTR
handling.
Refer to Section 7.3
HAAAA
HAAAA
HAAAA

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