Mitsubishi FX3U-20SSC-H User Manual page 261

FX -20SSC-H Positioning Block User's Manual
3U
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.
Read
command
Buffer memory No.
D200.0
D200.1
D200.F
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.
Read
command
Buffer memory No.
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.
Read
command
Buffer memory No.
FNC 78
K1 K28
FROM
Unit No.
FNC 79
K1 K518
TO
Unit No.
FNC 79
K1 K518
TO
Unit No.
12.1 Reading/Writing Buffer Memory
D200 K1
Number of transfer
points
Transfer destination
M20
M21
M35
K4M20 K1
Number of transfer
points
Transfer source
D201.0
D201.1
D201.F
D201 K1
Number of transfer
points
Transfer source
12 Program Example
11
12
13
A
B
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