Appendix – Lenze I/O system 1000 System Manual User Manual
Page 735
Appendix
Serial process interfacing
Principle of backplane bus communication
l
735
EDSIO1000 EN 7.0
Example of transmission with fragmentation: IO size = 16 bytes, length = 50 bytes
Header
Higher−level system
EPM−S640/EPM−S650
Description
Byte
Value
Byte
Value
0
09
h
Command: start transmission with
fragmentation.
1
00
h
Telegram information
2
00
h
User data length high byte
3
32
h
User data length low byte
4 ... 15
x
User data byte 0 ... 11
®
¬
0
90
h
Status: fragmented transmission started.
1. fragment
Higher−level system
EPM−S640/EPM−S650
Description
Byte
Value
Byte
Value
0
00
h
Fragment number
1 ... 15
x
User data byte 12 ... 26
®
¬
0
00
h
Acknowledgement 00
h
2. fragment
Higher−level system
EPM−S640/EPM−S650
Description
Byte
Value
Byte
Value
0
01
h
Fragment number
1 ... 15
x
User data byte 27 ... 41
®
¬
0
10
h
Acknowledgement 01
h
Note: At the first fragment, the serial
number 01 is transferred. In the
acknowledgement, this information is
returned in a mirrored manner.
Last fragment
Higher−level system
EPM−S640/EPM−S650
Description
Byte
Value
Byte
Value
0
0A
h
Fragment number
1 ... 8
x
User data byte 42 ... 49
11 ... 15
−
Not used
®
¬
0
A0
h
Acknowledgement of last fragment