6.2.3 Request/Response Handling
The RC portion of the PCA word defines the requests that
may be issued from the master to the slave as well as
what other portions of the PCV (IND and PVA) are
involved. The PVA portion transmits word-size parameter
values in bytes 7 and 8, while long word size values
require bytes 5 to 8 (32 bits). If the Response/Request
contains array elements, the IND carries the Array Sub-
index. If parameter descriptions are involved, the IND holds
the Record Sub-index of the parameter description.
6.2.4 RC Content
Request
Function
0
No request
1
Request parameter value
2
Change parameter value (word)
3
Change parameter value (long word)
4
Request description element
5
Change description element
6
Request parameter value (array)
7
Change parameter value (array word)
8
Change parameter value (array long word)
9
Request number of array elements
10-15
Not used
Table 6.3 Request
If the slave rejects a request from the master, the RC word
in the PPO-read indicates this by assuming the value 7.
The fault number is carried by bytes 7 and 8 in the PVA
element.
Response
Function
0
No response
1
Transfer parameter value (word)
2
Transfer parameter value (long word)
3
Transfer description element
4
Transfer parameter value (array word)
5
Transfer parameter value (array long word)
6
Transfer number of array elements
7
Request rejected (incl. fault #, see below)
8
Not serviceable by PCV interface
9
Not used
10
Not used
11
Not used
12
Not used
13-15
Not used
Table 6.4 Response
Fault
no.
Interpretation
0
Illegal PNU
1
Parameter value cannot be changed
2
Upper or lower limit exceeded
3
Subindex corrupted
4
No array
5
Data type false
6
Cannot be set by user (reset only)
7
Description element cannot be changed
8
IR required PPO-write not available
9
Description data not available
10
Access group
11
No parameter write access
12
Key word missing
13
Text in cyclical transmission not readable
14
Name in cyclical transmission not readable
15
Text array not available
16
PPO-write missing
17
Request temporarily rejected
18
Other fault
19
Data in cyclical transmission not readable
130
There is no bus access to the parameter called
131
Data change is not possible because factory setup has
been selected
Table 6.5 Fault No.
6.2.5 Example
This example shows how to use PPO type 1 to change the
ramp-up time (
3-41 Ramp 1 Ramp Up Time
) to 10 s and to
command a start and speed reference of 50%.
Frequency converter parameter settings:
8-50 Coasting Select
: Bus
parameter 8-10 Control Profile
: PROFIdrive profile
6.2.6 PCV
PCA Parameter Characteristics
PCA part (byte 1-2).
The RC part tells what the PCV part must be used for. The
functions available appear from the table, see
chapter 6.2.1
PCA Handling
.
When a parameter is changed, choose value 2 or 3. In this
example 3 is chosen, because
3-41 Ramp 1 Ramp Up Time
covers a long word (32 bits).
3-41 Ramp 1 Ramp Up Time
=155 hex: In this example byte
1 and 2 are set to 3155.
IND (bytes 3-4)
Used when reading/changing parameters with sub-index,
for example
9-15 PCD Write Configuration
. In the example
bytes 3 and 4 are set to 00 Hex.
How to Control the Frequenc...
Operating Instructions
MG90U302
Danfoss A/S © Rev. 2014-02-27 All rights reserved.
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Содержание VLT PROFINET MCA 120
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