Mitsubishi Electric FX3U-232-BD User Manual page 679

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX
6. b14 (send/receive data buffer data length)
The data is handled as shown below according to the buffer data length.
1) 16-bit (b14 = 0)
Send/receive data buffer
Highest-order 8 byte
Example of send data buffer
BFM
S
#1001
T
lowest-
X
order byte
2) 8-bit (b14 = 1)
Send/receive data buffer
Ignored
Example of send data buffer
BFM
S
#1001
T
lowest-
X
order byte
-232IF)
2N
Lowest-order 8 byte
BFM BFM BFM
#1001 #1002 #1002
highest- lowest- highest-
order byte order byte order byte
Lowest-order 8 byte
BFM BFM BFM
#1002 #1003 #1004
lowest- lowest- lowest-
order byte order byte order byte
16-bit data is divided into
lowest-order 8-bit and highest-
order 8-bit when being sent or
received.
E
T
X
Highest-order 8-bit are ignored.
Only lowest-order 8-bit are sent
and received as valid data.
E
T
X
5 Creating Programs
5.4 Buffer Memory (BFM)
A
B
C
D
E
F
G
H
I
Apx.A
G-23