6.2 PCV Parameter Access
Parameter access via the PCV channel is performed by the PROFINET cyclical data exchange, where the PCV channel is part
of the PPOs described in chapter 6 How to Control the Frequency Converter.
Using the PCV channel it is possible to read and write parameter values, as well as readout of a number of describing
attributes of each parameter.
6.2.1 PCA Handling
The PCA part of PPO types 1, 2 and 5 can handle several tasks. The master can control and supervise parameters and
request a response from the slave, whereas the slave can respond to a request from the master. Requests and responses is a
handshake procedure and cannot be batched, meaning that if the master sends out a read/write request, it has to wait for
the response, before it sends a new request. The request or response data value will be limited to maximum 4 bytes, which
implies that text strings are not transferable. For further information, see chapter 9 Application Examples.
6.2.2 PCA - Parameter Characteristics
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RC SMP PNU
Table 6.2 PCA - Parameter Characteristics
RC: Request/response characteristics (Range 0..15)
SMP: Spontaneous Message (Not supported)
PNU : Parameter no. (Range 1..1999)
How to Control the Frequenc... Operating Instructions
26 Danfoss A/S © Rev. 2014-02-27 All rights reserved. MG90U302
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