Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 350

(2) Non-conversion Variable
(a) Procedures
The E71 processes a Non-conversion Variable element as follows.
When the setting for "Unit of Stored Data" is "Lower Byte + Upper Byte"
• When the data length of a send packet is an odd number, the upper byte (lower byte for "Byte Swap") of
the last device is not sent.
• When the data length of a receive packet is an odd number, the last data is stored with one byte of 00
When sending data whose length is an odd number
Ex.
(Word)
+ 0
Data length storage area
+ 1
Data storage area
+ 2
+ 3
When receiving data whose length is an odd number
Ex.
(Word)
Data length storage area + 0
Data storage area + 1
+ 2
+ 3
(Word)
Data length storage area + 0
Data storage area + 1
+ 2
+ 3
When the setting for "Unit of Stored Data" is "Lower Bytes Only"
• Twice the size of the data length is occupied.
For the upper data, the E71 ignores the data at sending and adds 00
348
No byte swap
Specified device
0005
H
0201
H
Sending
0403
H
0605
H
Byte swap
No byte swap
Specified device
0005
H
0201
H
0403
H
0005
H
Specified device
Byte swap
0005
H
0102
H
0304
H
0500
H
Send data
06 05 04
H H H
↑
Data are not sent.
↓
05 06 03
H H H
Receiving
01 02
H H
Connected
device
03 02 01
H H H
04 01 02
H H H
Connected
device
Send data
03 04 05
H H H
to the data at receiving.
H
.
H