Bfm #20] Data Exchange Control; Bfm #21] Function Mode - Mitsubishi Electric MELSEC-F FX3U-J1939 User Manual

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FX
-J1939 User's Manual
3U
5.3

[BFM #20] Data Exchange Control

This flag is used when data consistency is required for data exchange between data area in BFM #100 to
#399 and BFM #1300 to #1799.
Bit
Data consistency flag;
Bit 0
To keep data consistency over a certain data area in BFM #100 to #399 and BFM #1300 to #1799, write all data required to
be treated consistent to the data BFMs and then set the "Data consistency flag" afterwards. The flag is reset automatically.
Bit 1 to 15 Not used
5.4

[BFM #21] Function Mode

Sets up function mode of FX
mode set in BFM #21.
Caution
A new valid value written to BFM #21, #24, #25 bit 2, #26, #27 is automatically written to flash ROM.
The maximum number of writes to the built-in flash ROM is 10,000 times.
Therefore, when creating a program, do not frequently write to such buffer memories.
Note
• A change of the function mode requires a restart of the FX
Set Value
K11
K29
K1939 (default)
Other value
-J1939. FX
-J1939 chooses a communication mode based on the function
3U
3U
Function Mode
Layer 2 communication (11 bit ID) mode
Layer 2 communication (29 bit ID) mode
J1939 communication mode
Setting prohibited
If setting other values, FX
-J1939 keeps the former value.
3U
5 Allocation of Buffer Memories
5.3 [BFM #20] Data Exchange Control
Description
-J1939 to become effective.
3U
For module restart, refer to Section 5.7
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