4.2. I/O Assembly Instances
I/O Assembly Instances are a number of defined process control objects with defined content
comprising control and status information. The figure below shows the I/O Assembly Instance
options for controlling and monitoring the frequency converter.
4.3. Process Data
Process data comprises the control and status data in the I/O Assembly Instances.
The CTW, MRV and STW and MAV have defined formats and functions, depending upon the I/O
Instance chosen. PCD1 and PCD2 are freely configurable for instance 101/151 via par. 10-11 and
10-12.
The VLT DeviceNet provides a flexible way for the user to customize the number of Process Data
(I/O words) and the functionality of each word. To activate the user definable process data, select
the I/O Instance 101/151 in par. 10-10
Process Data Type Selection
. This will change the I/O size
to four words in the input and output area. This selection uses the Danfoss-specific profile for the
Control word and Status word as well for the Main Reference Value/Main Actual Value.
The first two words are fixed on the VLT DeviceNet, whereas the user can select the input and
output, PCD 3 and PCD 4. The number of PCDs active in a system is fixed to 2 words.
NB!
Selection of Instance 101/151 under par. 10-10 is only possible if FC Profile has been
selected in par. 8-10
Control Word Profile
.
To enable use of PCD data from the VLT DeviceNet, configure the contents of each single PCD
word in par. 10-11
Process Data Config Write
and par. 10-12
Process Data Config Read
. Changes
to par. 10-11 and 10-12 are effected immediately in the PCD data.
FC 100/ 200/ 300 DeviceNet 4. How to Control the Frequency Converter
MG.33.D3.02 - VLT
®
is a registered Danfoss trademark
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