Lenze E82ZAFPC010 - Manual (Page 39)

Commissioning
Configuring the host system (master)
Defining the user data length
6
l
39 EDS82ZAFPC010 EN 4.0
6.3.2 Defining the user data length
The user data length is defined during the initialisation phase of the PROFIBUS. It is
possible to configure up to 10 process data words (see chapter "Process data transfer",
^ 43).
Optionally you can activate a parameter data channel. If the parameter data channel is
active, it additionally occupies 4 words of the process input and process output data.
ƒ PIW: process data input word (process data from standard device to master)
ƒ POW: process data output word (process data from master to standard device)
The user data lengths for process input data and process output data are identical. The
selection takes place via identification bytes in the configuration software for the
PROFIBUS system.
Parameter data channel Process data channel
Without /
with Identification / user data length Identification / user data length
Without −
l Identification
– without consistency: 70
hex
... 79
hex
(112 ... 121)
– with consistency: F0
hex
... F9
hex
(240 ... 249)
l User data length: 1 ... 10 words
(POW1/PIW1 ... POW10/PIW10)
With
l Identification: F3
hex
(243)
l User data length: 4 words
(word 1 ... word 4)
l Identification
– without consistency: 70
hex
... 79
hex
(112 ... 121)
– with consistency: F0
hex
... F9
hex
(240 ... 249)
l User data length: 1 ... 10 words
(POW1/PIW1 ... POW10/PIW10)
General structure of the identification byte
MSB LSB
7 6 5 4 3 2 1 0
Data length
00 1 byte or 1 word
...
15 16 bytes or 16 words
Input/output
00 Special identification format
01 Input
10 Output
11 Input and output
Length/format
0 Byte
1 Word
Consistency
0 Byte or word
1 Total length