Mitsubishi FX3U-20SSC-H - 12.4 Sequence Program

12 Program Example
12.1 Reading/Writing Buffer Memory
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FX3U-20SSC-H Positioning Block User's Manual
11
Buffer Memory
12
Program Example
13
Diagnostics
A
List of Parameters and Data
B
Version Information
b) Reading and transferring bit information to data registers
In the program below, the contents of the buffer memory (BFM #28) in unit No. 1 are read and
transferred to a data register (D200). The read bit information is used in bit specification of word
devices.
c) Writing bit information of auxiliary relays to the buffer memory
In the program below, the ON/OFF status of auxiliary relays (M20 to M35) is written to the buffer
memory (BFM #518) in unit No. 1.
d) Writing bit information stored in data registers to the buffer memory
In the program below, the ON/OFF status of each bit of a data register (D201) is written to the buffer
memory (BFM #518) in unit No. 1. Each bit of the data register (D201) should be set to ON or OFF in
advance by bit specification of word devices.
D200.0
D200.1
D200.F
Read
command
FNC 78
FROM
K1 K28 D200 K1
Transfer destination
Number of transfer
points
Unit No.
Buffer memory No.
M20
M21
M35
Read
command
FNC 79
TO
K1 K518 K4M20 K1
Transfer source
Number of transfe
r
points
Unit No.
Buffer memory No.
D201.0
D201.1
D201.F
Read
command
FNC 79
TO
K1 K518 D201 K1
Transfer source
Number of transfe
r
points
Unit No.
Buffer memory No.