Mitsubishi FX3U-64CCL, User Manual

Page: 47 / 78

7 Buffer Memory
7.2 Buffer memory details
41
FX
3U
-64CCL User's Manual
1
Introduc
tion
2
Specifi
cation
and func
tion
3
Sy
stem
Configurati
on
4
Ins
tal
lation
5
W
iri
ng, S
tart-up
proced
ure
6
FX
3U
-64C
CL
settin
g (swi
tch
settin
g)
7
Buf
fer
M
emor
y
8
Program Ex
ampl
e
9
Troubl
es
hooti
ng
A
Ve
rs
ion
Inform
ation
7.2.12 [BFM#60 to 63] Consistency control
Use these buffer memory addresses for consistency control to send or receive link data composed of 1 word
(16 bits) or more or 2 words (32 bits) or more.
These buffer memory addresses assure data consistency for 1 word (16 bits) or more when read or written by
the FROM/TO instructions, or data consistency for 2 words (32 bits) or more when read or written by the
DFROM/DTO instructions.
Consistency control operation examples and a sequence program example are as follows:
1) Explanation of RY and RWw consistency flag operation
BFM No. Description Explanation
#60 RX area consistency flag 1: Consistency accessibility start
Set the latest data, and stop the buffer memory from being refreshed.
0: Data consistency accessibility is completed or not used.("0" is the initial value.)
Refresh the communication data and buffer memory as required.
(When a device changes from "1" to "0", the unit resumes refreshing the communication
data and buffer memory.)
When any other number is set, these devices do not control the consistency in the same
way as "0".
#61 RY area consistency flag
#62 RWw area consistency flag
#63 RWr area consistency flag
• RY area consistency flag
• RY area data area
• RWw area data area
• RWw area consistency flag
Receive data
with refresh Receive data
with refresh
Resume
receiving data
with refresh
Receive data
with refresh
TO instruction (K1) TO instruction (K1)
TO instruction (K0)
The unit refreshes
to obtain the latest
data in accordance
with the consistency
flag, and then stops
refreshing.
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
BFM
Buffer memory