Mitsubishi Electric MELSEC iQ-RJ71C24-R2

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APPENDICES APPENDIX

Appendix 5 Operation Image and Data Structure of Predefined Protocol

529

Non-conversion variable

■Processing procedure

C24 processes non-conversion variable according to the following procedure.

“ABCD”

“ABCD”←“BADC”

“ABCD”→“BADC”

'B'

(42h)

'A'

(41h)

'D'

(44h)

'C'

(43h)

'A'

(41h)

'B'

(42h)

'C'

(43h)

'D'

(44h)

'A'

(41h)

'B'

(42h)

'C'

(43h)

'D'

(44h)

'B'

(42h)

'A'

(41h)

'D'

(44h)

'C'

(43h)

'B'

(42h)

'D'

(44h)

'A'

(41h)

'C'

(43h)

'A'

(41h)

'B'

(42h)

'C'

(43h)

'D'

(44h)

'A'

(41h)

'B'

(42h)

'C'

(43h)

'D'

(44h)

'B'

(42h)

'A'

(41h)

'D'

(44h)

'C'

(43h)

00h

C24

“ABCD”

“ABCD"

(Byte swap)

(Fixed length/Variable length)

(Data length/Maximum data length)

(Unit of stored data)

When "Byte swap" is ’Disable’

Unit of

stored data

Lower bytes only

Lower byte + Upper byte

Data

storage

area

Disable byte swap

C24

ignores data of upper bytes

CPU device

G device

Data transmission

Swapping

send data

Send data

Enable byte swap

When "Byte swap" is ’Enable’

Unit of

stored data

Lower byte + Upper byte

Lower bytes only

Data

storage

area

C24

ignores data of upper bytes

(Byte swap)

(Fixed length/Variable length)

(Data length/Maximum data length)

(Unit of stored data)

When "Byte swap" is ’Disable’

Unit of

stored data

Lower bytes only

Lower byte + Upper byte

Data

storage

area

Disable byte swap

CPU device

G device

C24

stores 00h to upper bytes

Data reception

Swapping

receive data

Receive data

Enable byte swap

When "Byte swap" is ’Enable’

Unit of

stored data

Lower bytes only

Lower byte + Upper byte

Data

storage

area

C24

stores 00h to upper bytes

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