
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)
…
Kommentare zu diesen Handbüchern