Lenze I/O system 1000 System Manual - Manual (Page 739)

Appendix
Serial process interfacing
Principle of backplane bus communication
15
l
739 EDSIO1000 EN 7.0
Example of reception with fragmentation: IO size = 16 bytes, length = 40 bytes
Header
Higher−level system EPM−S640/EPM−S650 Description
Byte Value Byte Value
0 09
h
Information: Data are transferred with
fragmentation.
1 00
h
Information: The telegram does not
contain any additional offset data.
2 00
h
High byte length
3 2A
h
Length of low byte + 2 bytes for RetVal
6 00
h
RetVal high byte
7 00
h
RetVal low byte
6 ... 15 x User data bytes 0 ... 9
¬
0 90
h
® 0 Acknowledgement
1. fragment
Higher−level system EPM−S640/EPM−S650 Description
Byte Value Byte Value
0 00
h
Fragment information
1 ... 15 x User data bytes 10 ... 24
¬
0 00
h
® 0 Acknowledgement
Last fragment
Higher−level system EPM−S640/EPM−S650 Description
Byte Value Byte Value
0 0A
h
Fragment information
1 ... 15 x User data bytes 25 ... 39
¬
0 00
h
® 0 Acknowledgement, input area free for
new data.