Allocation Of Buffer Memories; Buffer Memories (Bfm) Lists - Mitsubishi Electric MELSEC-F FX3U-CAN User Manual

FX -CAN User's Manual
3U
6.

Allocation of Buffer Memories

6.1

Buffer Memories (BFM) Lists

Caution
• Do not access buffer memory (BFM) that is marked as "Reserved" (Ex. BFM #23, #28, #31 to #34, #40 to
#49, #60 to #99, #400, #443 to #600, etc.) by FROM/TO instructions, etc. There is a possibility to cause
abnormal behavior to the operation of the FX
• When BFM #21, #24, #26, #27, #59, #70, #71, #100 to #399, #1100 to #1267, #1900 to #1927 are written
to, FX -CAN stores the state of the corresponding BFM in the built-in flash ROM. The maximum number
3U
of writes to the built-in flash ROM is 10,000 times.
While BFM #25 bit7 is ON, any TO access is prohibited and will generate a BFM #29 bit5 failure!
Note
• When writing to a BFM that contains any bits marked as "Reserved" (Ex. BFM #20 bit 1 to bit 15, BFM #22
bit 2 to bit 15, etc), set such bits to OFF.
There is a possibility to cause abnormal behavior to the operation of the FX
ON.
• Use BFM #22 to store the configuration.
BFM No.
BFM #0 to #19
BFM #20
BFM #21
BFM #22
BFM #23
BFM #24
BFM #25
BFM #26
BFM #27
BFM #28
BFM #29
BFM #30
BFM #31 to #34
BFM #35
BFM #36
BFM #37
BFM #38
BFM #39
BFM #40
BFM #41 to #49
Description
Receive/Transmit Process Data
®
(CANopen modes only)
Data Exchange Control
Function mode
Save/Restore Configuration
Reserved
Baud Rate
Communication Status
FROM/TO Watchdog
Node Address
®
(CANopen modes only)
Reserved
Error Status
Module ID code
Reserved
CAN transmission error counter
CAN reception error counter
Baud Rate display
Sampling Point display
BFM setting error display
BFM initialisation/online mode write error display
Reserved
-CAN if accessing these buffer memories.
3U
Default Read/
value Write
H0 R/W
H0 R/W
K405 R/W
H0 R/W
- -
K250 R/W
K0 R/W
K20 R/W
K127 R/W
- -
H0 R/W
K7170 R
- -
H0 R
H0 R
K2500 R
K875 R
H0 R
H0 R
- -
6 Allocation of Buffer Memories
6.1 Buffer Memories (BFM) Lists
-CAN if setting these flags to
3U
Stored to
Reference
Flash ROM
- *1
- Section 6.4
Section 6.5
- Section 6.6
- -
Section 6.7
- Section 6.8
Section 6.9
Section 6.10
- -
- Section 14.2
- Section 6.12
- -
- Section 6.13
- Section 6.14
- Section 6.15
- Section 6.16
- Section 6.17
- Section 6.18
- -
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