Lenze I/O system 1000 System Manual - Manual (Page 734)

Appendix
Serial process interfacing
Principle of backplane bus communication
15
l
734 EDSIO1000 EN 7.0
Write fragment
Higher−level system EPM−S640/EPM−S650 Description
Byte Function Byte Function
0 Control byte Bits 3...0:
0
h
... 7
h
= fragment number
8
h
= idle state, no data available.
B
h
= carry out a reset on the EPM−S6x0.
Bits 7...4:
Reserved for reception.
1 ... n−1 User data User data; n = number of the bytes
assigned in the address range (IO size)
®
¬
0 Acknowledgement
/ status Bits 3...0:
Reserved for reception.
Bits 7...4:
0
h
... 7
h
= acknowledgement fragment
number
8
h
: acknowledgement, idle state
9
h
: fragmented transmission started.
C
h
: status, reset was carried out on
EPM−S6x0.
D
h
: status, the length specified is invalid.
E
h
: status, EPM−S6x0 communication
error, partner is not responding.
Write last fragment
Higher−level system EPM−S640/EPM−S650 Description
Byte Function Byte Function
0 Control byte Bits 3...0:
8
h
= idle state, no data available.
A
h
= transmission of last fragment.
B
h
= carry out a reset on the EPM−S6x0.
Bits 7...4:
Reserved for reception.
1 ... n−1 User data User data; n = number of the bytes
assigned in the address range (IO size)
®
¬
0 Acknowledgement
/ status Bits 3...0:
Reserved for reception.
Bits 7...4:
8
h
: acknowledgement, idle state
A
h
: acknowledgement, last fragment
received.
C
h
: status, reset was carried out on
EPM−S6x0.
D
h
: status, the length specified is invalid.
E
h
: status, EPM−S6x0 communication
error, partner is not responding.