Mitsubishi MELSEC LJ71C24, Руководство пользователя

Страница: 369 / 428

App. - 40 App. - 40
APPENDIXES
Appendix 5.3.2 Non-conversion variable
(1) Processing procedure
The C24 processes Non-conversion variable according to the following
procedure.
Sending data
"ABCD"
"ABCD"
Enable byte swap
Disable byte swap
"ABCD"
(Byte swap)
(Fixed length/Variable length)
(Data length/Maximum data length)
(Unit of stored data)
Swapping
send data
(Byte swap)
Disable byte swap
Enable byte swap
Swapping
receive data
Receiving data
"ABCD"
CPU device
G device
Send data
Receive data
C24
ignores data of upper bytes
C24
ignores data of upper bytes
C24
stores 00h to upper bytes
C24
stores 00h to upper bytes
C24
(Fixed length/Variable length)
(Data length/Maximum data length)
(Unit of stored data)
"ABCD" "BADC"
"ABCD" "BADC"
00h
D0
D1
D2
D3 D0
D1
00h
00h
00h
Unit of
stored data
When "Byte swap" is ’Disable’
Lower byte + Upper byte
Lower bytes only
Data
storage
area
’B’
(42h)
’A’
(41h)
’D’
(44h)
’C’
(43h)
’A’
(41h)
’B’
(42h)
’C’
(43h)
’D’
(44h)
00h
D0
D1
D2
D3 D0
D1
00h
00h
00h
Unit of
stored data
Data
storage
area
When "Byte swap" is ’Enable’
Lower byte + Upper byte Lower bytes only
’A’
(41h)
’B’
(42h)
’C’
(43h)
’D’
(44h)
’B’
(42h)
’A’
(41h)
’D’
(44h)
’C’
(43h)
00h
D0
D1
D2
D3
D0
D1
00h
00h
00h
Unit of
stored data
When "Byte swap" is ’Disable’
Lower byte + Upper byte
Lower bytes only
’B’
(42h)
’D’
(44h)
’A’
(41h)
’C’
(43h)
’A’
(41h)
’B’
(42h)
’C’
(43h)
’D’
(44h)
CPU device
G device
Data
storage
area
00h
D0
D1
D2
D3 D0
D1
00h
00h
00h
Unit of
stored data
Data
storage
area
When "Byte swap" is ’Enable’
Lower byte + Upper byte Lower bytes only
’A’
(41h)
’B’
(42h)
’C’
(43h)
’D’
(44h)
’B’
(42h)
’A’
(41h)
’D’
(44h)
’C’
(43h)