Message Transmit Trigger Flags; Plc Run>Stop Messages - Mitsubishi Electric MELSEC-F FX3U-CAN User Manual

FX -CAN User's Manual
3U
9.5

Message Transmit Trigger Flags

The transmission of a message in Layer 2 mode can be triggered via the following flags.
Transmit requests on receive Layer 2 messages are discarded. When a bit is set to ON, the corresponding
transmit message will be sent as soon as a transmit buffer is available. The flags are reset automatically as
soon as the message is written into the transmit buffer.
BFM No.
BFM #1280
BFM #1281
BFM #1282
9.6 PLC RUN>STOP Messages
FX -CAN can transmit the message according to its state, if the PLC is in one of the following two states.
3U
Up to four transmit messages can each be registered.
• If PLC state had changed to STOP from RUN, or FROM/TO Watchdog in FX
In this case, the message registered into RUN>STOP messages 1 to 4 are transmitted.
Warning
Depending on PLC Type and baud rate and bus load, FX
such a case, additional H/W and/or S/W should be considered for safe system behavior.
If possible use only one "RUN>STOP message" which will increase the possibility that the information is
transmitted in the event "RUN>STOP" occurs.
If more than one message is defined, messages are transmitted in order of priority "message 1" to "message
4".
Note
• The time differs depending on the number of I/Os and on the number and types of extension blocks.
BFM No.
BFM #1900 CAN-ID 1 LW
BFM #1901 CAN-ID 1 HW
BFM #1902
BFM #1903
BFM #1904
BFM #1905
BFM #1906
176
Bit No. Transmit request Layer 2 message
Bit 0 Layer 2 message 1
Bit 15 Layer 2 message 16
Bit 0 Layer 2 message 17
Bit 15 Layer 2 message 32
Bit 0 Layer 2 message 33
Bit 9 Layer 2 message 42
Bit 10 to 15 Reserved
Function
High Byte
11/29 bit CAN-Identifier low word
29 bit CAN-Identifier high word
DLC
2nd data byte
4th data byte
Data bytes
6th data byte
8th data byte
-CAN may be unable to send the message. In
3U
Description
Low Byte
Data length count
1st data byte
3rd data byte
5th data byte
7th data byte
9 CAN Layer 2 Mode
9.5 Message Transmit Trigger Flags
Remarks
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
-CAN has been timed-out
3U
Layer 2 Message Initial Value
HFFFF
HFFFF
H0
RUN>STOP
H0
message 1
H0
H0
H0