Profibus communication – Lenze 931K User Manual
Page 17
PROFIBUS communication
The data telegram
Structure of the receive and response message with PKW mechanism
l
17
KHB 13.0004−EN 2.1
Response message
The PNU 2000 must be entered under the same address as in the receive message.
ADR = 1
ADR = 2
ADR = 4
ADR = 12
ADR = 16
1st DWORD
2nd DWORD
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
...
...
Data 2nd PNU
PNU 2000
Status word 1 (PNU 968)
Mandatory wildcard (PNU 2010.0)
Telegram identifier
ƒ
Structure of PNU 2000:
(two data double words (2 × 4 bytes))
Byte 0 Byte 1 Byte 2 Byte 3
Byte 4 7
Parameter value
Subindex of PNU
PNU requested by the master
Identifier:
l
Write access: 42
h
)
Note!
ƒ
The PNU 2000 must be entered under the same address in the receive
message and in the corresponding response message!
ƒ
For reasons relating to the address register of the master’s CPU (see
documentation for the master), we recommend to use variables of the type
"double word" for the telegram.
If the telegram is generated byte by byte, a shift in the data telegram may
result which causes transmission errors.
ƒ
The transmission of a parameter is not acknowledged by the controller.