Mitsubishi FX3U-64CCL, User Manual

Page: 40 / 78

7 Buffer Memory
7.2 Buffer memory details
34
FX
3U
-64CCL User's Manual
7.2 Buffer memory details
7.2.1 [BFM#0 to #7] Remote I/O (RX/RY)
[BFM #0 to #7] Remote inputs/outputs (RX/RY) are compatible with the FX
2N
-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) RX/RY: BFM #0 to #7
b) RX: BFM #64 to #71 and RY: BFM #120 to #127 (within the range of "single" expanded transmission)
1) When the FROM instruction (or reading through direct buffer memory specification) is executed:
Remote outputs (RY) are requited
These devices read the output signal (Remote outputs RY) transmitted from the master station to the
64CCL.
2) When the TO instruction (or writing through direct buffer memory specification) is executed:
Remote inputs (RX) are requited
These devices write the input signal (Remote inputs RX) 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
• RX/RY for the upper word in the last station is occupied as the system area.
• When the expanded cyclic transmission is set to "double", "quadruple" or "octuple", writing with the TO
instruction (or direct buffer memory specification) to BFM#0 to #7 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.
: User area : System area -: 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
#0 RY00-0F RX00-0F
#1 RY10-1F RX10-1F
#2 RY20-2F RX20-2F -
#3 RY30-3F RX30-3F -
#4 RY40-4F RX40-4F - -
#5 RY50-5F RX50-5F - -
#6 RY50-5F RX60-6F - - -
#7 RY70-7F RX70-7F - - -
User area points 16 48 80 112
System area points 16 16 16 16
Total number of points 32 64 96 128
Buffer memory points
(System area is included)
2 4 6 8