Mitsubishi Electric MELSEC-F FX3U-CAN User Manual page 174

FX -CAN User's Manual
3U
BFM No.
BFM #387
BFM #388
BFM #389
BFM #390
BFM #391
BFM #392
BFM #393
BFM #394 to #399
*1. These BFM will be stored into the Flash ROM when the save command is executed.
*2. Receive messages are read only, transmit messages can be read and written.
1. When transmitting messages
The CAN-ID, RTR/new/DLC and data bytes of each message are as follows.
1) CAN-ID
The destination of the message is specified by CAN-ID. CAN-ID is as follows, corresponding to the
function mode to be used.
Function Mode
11 bit CAN-ID Layer 2 Mode
29 bit CAN-ID Layer 2 Mode
*2. The "n" corresponds to the Layer 2 message number.
2) RTR/new/DLC
RTR/new/DLC is set as follows.
High Byte/Low Byte
High byte
Low byte
*3. Bit 15 defines whether the message is transmitted as a data frame (Bit 15 = OFF) or a Remote
Transmit Request frame (Bit 15 = ON). Bit 12 = ON enables a strict DLC check for received RTR
frames. If Bit 12 is OFF, only the CAN-ID of an inbound RTR frame is checked for a match with a
user message; if the bit is ON, the CAN-ID and the DLC of the RTR frame must match the user
message to cause a response or BFM #1270 to #1272 flag to be set.
Bit 15 and Bit 12 cannot be set ON at the same time.
Bit 15 can be set ON if the parameter B is set to H5FFF.
Bit 12 can be set ON if the parameter B is set to H6FFF or H7FFF.
3) Data bytes
Store the data to transmit. The data length of the transmit data is set by DLC.
168
Name
High Byte
CAN-ID 42 LW 11/29 bit CAN-Identifier low word
CAN-ID 42 HW 29 bit CAN-Identifier high word
High Byte: Remote Transmission Request
RTR / new / DLC
Low Byte: Data length count
2nd data byte
4th data byte
Data bytes
6th data byte
8th data byte
Reserved
Store CAN-ID in the 11 bits, bit 0 to 10, in the CAN-ID n
In this function mode, CAN-ID n
Store CAN-ID in the 29 bits, bit 0 to 28, in the CAN-ID n
Handle CAN-ID n
Bit 12 ON: Strict DLC check for RTR
Bit 15 OFF: Send data frame
Bit 15 ON: Send RTR frame
Number of data bytes to transmit (K0 to K8)
Description
Low Byte
1st data byte
3rd data byte
5th data byte
7th data byte
→ For the save command, refer to Section 6.6
→ For function mode, refer to Section 6.5
Description
*2
HW are ignored.
*2 *2
LW and CAN-ID n HW by 32 bit instructions.
Description
*3
*3
→ For parameter B, refer to Section 9.3
9 CAN Layer 2 Mode
9.1 Receive/Transmit Process Data
Initial Read/
value Write
HFFFF R/W
HFFFF R/W
H0 R/W
Layer 2
*2
H0
message 42 R/W
*2
H0
R/W
*2
H0
R/W
*2
H0
R/W
- -
*2
LW.
*2 *2
LW and CAN-ID n HW.
Stored to
Flash ROM
*1
*1
*1
-
-
-
-
-