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Deployment
Principal communication via back plane bus > Receiving data
Principle of communica-
tion with fragmentation
Calculating the number of
fragments
Info-Byte
Telegram-Info-Byte
Length
48
Host system
Byte
Function
with n = number of used bytes in the address area (IO-Size)
After the data are processed in the host system, you have to send an acknowledge to the
CP, by copying bit 3...0 of byte 0 of the input area to bit 7...4 of byte 0 of the output area.
Only then the CP can send further data.
0
Acknowledgement
Bit 3...0
8h: Idle state - no data available
9h: Data were transferred with fragmentation
Ah: Data were transferred without fragmentation
Bit 7...4
Reserved for sending
00h:
The telegram does not contain any additional offset information.
04h:
The telegram contains additional offset data, which are located as word
after Length. With this offset the position of the user data in the input
area is defined.
Length of user data in byte plus 2 bytes for RetVal.
CP
Byte
Function
t
0
Info-Byte
1
Telegram-Info-Byte
2
Length high byte
3
Length low byte
[4]
Offset high byte
[5]
Offset low byte
6...n-1
User data
u
0
HB300 | CP | 040-1CA00 | en | 18-28
VIPA System SLIO
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