Mitsubishi Electric MELSEC-L Series - Page 349

347
APPENDICES
A
Appendix 8 Operation Image and Data Structure of Predefined Protocol Appendix 8.3 Data examples of packet elements
(b) Data flow
Data Flow is used to specify the order of send data and receive data.
"Forward Direction (Upper ByteLower Byte)", "Reverse Direction (Lower ByteUpper Byte)", and "Byte
Swap (by Word)" can be used as the Data Flow.
• Forward Direction and Reverse Direction: Available when the Data Length is 2 bytes or more.
• Byte Swap: Available only when the Data Length is 4 bytes.
(c) Calculating range for the length
The following shows the specification examples of calculating range for the length.
Length
Packet format
Example 1
Example 2
Example 3
Packet
element 1
Packet
element 2
Packet
element 3
Packet
element 30
Packet
element 31
Packet
element 32
Static dataStatic dataStatic data
Non-conversion
variable
Static data
Calculating
range for
the length
Calculating range for the length
Calculating range for the length
Example 1) Calculating range when its start is 3 and end is 3
Example 2) Calculating range when its start is 3 and end is 30
Example 3) Calculating range when its start is 1 and end is 32