Siemens ET 757 E Series Betriebsanleitung PDF herunterladen (Seite 103)

Commissioning and optimization (software)

7.4 Commissioning of communication between the S7 CPU and the frequency converter

ET 200pro FC

Operating Instructions, 11/2007, A5E01100763B AA

103

Note

Please note that the way cyclic data are interpreted depends on how the frequency converter

is parameterized (P2051, P0922).

7.4.3 Parameter transfer in the PROFIdrive profile

7.4.3.1 Block call

Acyclic data transfer can take place parallel to cyclic data transfer. The acyclic data transfer

mode allows:

● Large quantities of user data (on PROFIBUS up to 240 bytes) to be exchanged

● Access through other PROFINET hosts (Class 2 masters, or in the case of PROFINET IO

by other IO controllers, e.g. commissioning tools) is possible.

Use of the expanded bus functions

There are suitable channels available in the frequency converters for the different masters

and IO controllers and for the different data transmission rates:

● Acyclic data exchange with the same master class of Class 1 or the same IO controller:

Use of the READ and WRITE functions. In this case, the content of the transferred data

block corresponds to the structure of the non-cyclic parameter channel in accordance

with the PROFIdrive profile, V4.0 (with data block 47 (DS47)).

● Acyclic data exchange with the help of a SIEMENS startup tool (master of Class 2 or

supervisor) (e.g. STARTER). The startup tool can acyclically access parameters and

process data in the frequency converter.

● Acyclic data exchange with a SIMATIC HMI (Human Machine Interface) (second master

of Class 2 or second supervisor). The SIMATIC HMI can acyclically access parameters in

the frequency converter.

● Instead of a SIEMENS commissioning tool or a SIMATIC HMI it is also possible for an

external master (master of Class 2) or an external supervisor, as defined in the acyclic

parameter channel according to the PROFIdrive profile, Version 4.0 (with DS47), to

access the frequency converter.

Properties of the parameter channel

● One 16-bit address for each parameter number and subindex.

● Transfer of different parameters in one access (multiple request).

● Entire fields or parts of fields can be transferred.

● Only one parameter request is processed at a time (no pipelining).

● A parameter request/response must fit into a data set (on PROFIBUS: max. 240 bytes).

● The header of the task or the response are user data.

● Only 1 master or 1 supervisor on a frequency converter can be cyclically accessed at a

time.

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Siemens ET 757 E Series Betriebsanleitung Seite 103