Siemens SINAMICS G120 Original Instructions Manual page 156

Configuring the fieldbus
7.6 Communication via RS485
Parameter contents
Parameter contents can be parameter values or connector parameters. You require two
words for connector parameters. For interconnecting connector parameters please see
Section Interconnecting signals in the converter (Page 425).
Enter the parameter value in the parameter channel right-justified as follows:
• 8-bit values:
• 16-bit values:
• 32-bit values:
Enter a connector parameter right-justified as follows:
• Number of the connector parameter:
• Drive object of the connector parameter:
• The index or bit field number of the connector parameter:
Telegram examples, length of the parameter channel = 4
Read request: Read out serial number of the Power Module (p7841[2])
To obtain the value of the indexed parameter p7841, you must fill the telegram of the
parameter channel with the following data:
● PKE, bit 12 ... 15 (AK): = 6 (request parameter value (field))
● PKE, bit 0 ... 10 (PNU): = 1841 (Parameter number without offset)
● IND, bit 8 ... 15 (page index): = 90 hex (offset 6000 ≙ 90 hex)
● IND, bit 0 ... 7 (subindex): = 2 (Index of the parameter)
● Because you want to read the parameter value, words 3 and 4 in the parameter channel
for requesting the parameter value are irrelevant. They should be assigned a value of 0,
for example.
Figure 7-11 Telegram for a read request from p7841[2]
156
Low word, bits 0 ... 7,
Low word, bits 0 ... 15,
Low word and high word
Parameter number = PNU + offset (page index)
(7841 = 1841 + 6000)
bits 8 ... 15 are zero.
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
High word
Low word, bits 10 ... 15
Low word, bits 0 ... 9