7.2.12 [Bfm#60 To 63] Consistency Control - Mitsubishi FX3U-64CCL User Manual

FX -64CCL User's Manual
3U

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.
BFM No.
#60 RX area consistency flag
#61 RY area consistency flag
#62 RWw area consistency flag
#63 RWr area consistency flag
Consistency control operation examples and a sequence program example are as follows:
1) Explanation of RY and RWw consistency flag operation
• RY area consistency flag
• RWw area consistency flag
Buffer memory
• RY area data area
• RWw area data area
Description
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".
TO instruction (K1)
Receive data Receive data
with refresh with refresh
BFM BFM
BFM BFM
BFM BFM
BFM BFM
Explanation
TO instruction (K1)
The unit refreshes
to obtain the latest
Resume
data in accordance
receiving data
with the consistency
with refresh
flag, and then stops
refreshing.
BFM BFM
BFM BFM
BFM BFM
BFM BFM
7 Buffer Memory
7.2 Buffer memory details
TO instruction (K0)
Receive data
with refresh
BFM BFM
BFM BFM
BFM BFM
BFM BFM
41
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9
A