Configuring the fieldbus
6.2 Communication via RS485
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
129
6.2.2.7
USS write job
Example: Define digital input 2 as source for ON/OFF in CDS1
In this case, parameter p0840[1] (source, ON/OFF) must be assigned the value 722.2 (digital
input 2).
The parameter channel comprises four words (p2023 = 4). To change the value of the
indexed parameter P0840, you must fill the telegram of the parameter channel with the
following data:
●
Change parameter value (field): Enter bit 15 … 12 in PKE (1st word):
Request identifier = 7
●
Parameter number without offset: Enter bit 10 … 0 in PKE (1st word):
As the parameter is < 1999, it can be directly entered without an offset - converted into
hex - in the example 840 = 348H.
●
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- 26 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: 63)
0x0002
Summary of Contents for SINAMICS G120 CU230P-2
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