Siemens ET 757 E Series Betriebsanleitung Seite 104

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Commissioning and optimization (software)
7.4 Commissioning of communication between the S7 CPU and the frequency converter
ET 200pro FC
104 Operating Instructions, 11/2007, A5E01100763B AA
Structure of parameter request and parameter response
Each parameter request consists of three parts:
Request header:
ID for the request and number of parameters being accessed.
Parameter address:
Addressing a parameter. If multiple parameters are being accessed there will be a
corresponding number of parameter addresses. The parameter address appears in the
request and not in the response.
Parameter value:
For each parameter addressed there is a segment for the parameter values. Depending on
the request ID, the parameter values appear either only in the request or in the response.
Table 7-10 Parameter request
Word
Byte Byte
Request reference Request ID Request header
Drive object ID Qty Parameters
Attribute Qty of elements
Parameter number (PNU)
1. Parameter address
Subindex
Attribute Qty of elements
Parameter number (PNU)
n. parameter address
Subindex
Format Qty Values
Values
1. parameter value(s) (only in the
case of "change parameters"
request)
Format Qty Values
Values
n. parameter value(s)
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