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Connection to a fieldbus
6.4 Communication via RS485
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
141
● Enter the offset of the parameter number in byte page index of word IND (2nd word):
in this example = 0.
● Enter the index of parameter in the byte subindex of word IND (2nd word):
for this example = 1 (CDS1)
● Enter a new parameter value in PWE1 (Word3):
in the example 722 = 2D2H.
● Drive Object: Enter bit 10 … 15 in PWE2 (4th word):
for SINAMICS G120, always 63 = 3FH
● Index of the parameter: Enter bit 0 … 9 in PWE2 (word4):
in example 2.
Table 6- 25 Request to change p0840[1]
PKE (1st word)
IND (2nd word)
PWE (3rd and 4th words)
PWE2(L word)
AK
PNU:
Page index
(H byte)
Subindex
(L byte)
PWE1(H word)
Drive
Object
15 … 12 11
10 … 0
15 … 8
7 … 0
15 … 0
15 … 10
9 … 0
0x7
0
0x348
(dec: 840)
0x0000
0x01
0x2D2
(dec: 722)
3F
(fixed)
(dec: 66)
0x0002
6.4.2.7
USS process data channel (PZD)
Description
Process data (PZD) is exchanged between the master and slave in this telegram range.
Depending on the direction of transfer, the process data channel contains request data for
the slave or response data to the master. The request contains control words and setpoints
for the slaves, while the response contains status words and actual values for the master.
67:
+6:
67:
S
=6:
+,:
=6:
S
S
3='
3='
3='
3='
3='
3='
3='
3='
3='
3='
5HVSRQVH
WR866PDVWHU
5HTXHVW
WR866VODYH
Figure 6-16 Process data channel