7 Buffer Memory
7.2 Buffer memory details
35
FX3U-64CCL User's Manual
1
Introduction
2
Specification
and function
3
System
Configuration
4
Installation
5
Wiring, Start-up
procedure
6
FX
3U
-64CCL
setting (switch
setting)
7
Buffer Memory
8
Program
Example
9
Troubleshooting
A
Version
Information
7.2.2 [BFM#8-#23] Remote register (RWw/RWr)
[BFM #8 to #23] Remote registers (RWw/RWr) are compatible with the FX2N-32CCL.
This area is available only when the expanded cyclic transmission is set to "single".
When the expanded cyclic transmission is set to "single", either of the following is available:
a) RWw/RWr: BFM #8 to #23
b) RWw: BFM #176 to #191 and RWr: BFM #304 to #319 (within the range of "single" expanded cyclic
transmission)
1) When the FROM instruction (or reading through direct buffer memory specification) is executed:
Remote registers (RWw) are involved
These devices read the data (Remote registers RWw) transmitted from the master station to the 64CCL.
2) When the TO instruction (or writing through direct buffer memory specification) is executed:
Remote registers (RWr) are involved
These devices write data (Remote registers RWr) to be transmitted from the 64CCL to the master station.
When the TO instruction (or direct buffer memory specification) is executed for writing to an area without
assigned link points, writing is invalid.
When the FROM instruction (or direct buffer memory specification) is executed for reading from an area
without assigned link points, the reading operation results in "0" being read.
The table below shows details for buffer memory allocation.
Caution
• When the expanded cyclic transmission is set to "double", "quadruple" or "octuple", writing with the TO
instruction (or direct buffer memory specification) to BFM#8 to #23 is invalid, and reading with the FROM
instruction (or direct buffer memory specification) results in "0".
• Refer to Appendix B for differences between the 64CCL and the FX
2N-32CCL.
: Applicable -: With no allocation
BFM No.
Read (FROM
instruction)
Write (TO
instruction)
Number of occupied stations (Expanded cyclic setting : single)
Occupies 1 station Occupies 2 stations Occupies 3 stations Occupies 4 stations
#8 RWw0 RWr0
#9 RWw1 RWr1
#10 RWw2 RWr2
#11 RWw3 RWr3
#12 RWw4 RWr4 -
#13 RWw5 RWr5 -
#14 RWw6 RWr6 -
#15 RWw7 RWr7 -
#16 RWw8 RWr8 - -
#17 RWw9 RWr9 - -
#18 RWwA RWrA - -
#19 RWwB RWrB - -
#20 RWwC RWrC - - -
#21 RWwD RWrD - - -
#22 RWwE RWrE - - -
#23 RWwF RWrF - - -
BFM (word) points 4 8 12 16
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