Restrictions for user-defined configuration settings:
• The PKW object is allowed only once at slot 1.
• At least one PZD object must be configured.
• The total number of bytes must be less than or equal to 24 bytes (12
words).
If the restrictions are not followed, a configuration error is signaled by the controller
(PLC) upon PROFINET startup.
7.2 Available objects
The configured data exchange objects generally have two components which are
available either fully, partly or not at all in the different object configurations. These
components are the communication channel and the process channel.
The communication channel (PKW object) is used for access (write/read) to any
parameters in the frequency inverter. The string parameters to which no access is
possible form an exception. The communication follows a defined handshake proce-
dure and includes several cyclic data exchange cycles.
The process data channel (PZD object) is processed in each cycle. Reference
values are taken over and actual values are handed over. Thus, the data is updated
with each cyclic data exchange.
Transmission direction IO controller IO device (OUT)
HSW = Main reference
value
Transmission direction IO device IO controller (IN)
Process data channel objects PZD1/PZD2 are fixed and cannot be edited. This defi-
nition also applies to user-defined configurations.
The contents of process data channels PZD3 through PZD12 (maximum, without
communication channel PKW) are user-defined.
In the data transmission, it is assumed that the Motorola format is used as sup-
ported by a PLC type Siemens S7.
28 CM-PROFINET 10/13
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