Danfoss FCM 300 User Manual

FCM 300 / FCD 300 / VLT
®
2800 / DP V1 PROFIBUS
Profibus
DP
■ PCA handling
The PCA portion of the PPO types 1, 2 and 5
will handle a number of tasks. The master may
control and supervise parameters and request a
response from the slave, while the slave, apart
from responding to a request from the master m ay
transmit a spo ntaneous message.
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 l imited to m a x. 4 bytes,
which imp lies that text strings are not transferable. For
further information, please see section Examples .
PCA - Parameters Characteristics
15 14 13 12 11 109876543210
RC SMP PNU
RC: Request /respons Characteristics (Range 0..15)
SPM: Toggle-Bit for Spontaneous Messages
PNU: Parameter # (Range 1..1999)
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 P VA portion will transmit word-size parameter
values in bytes 7 and 8, while long word size
valuesrequirebytes5to8(32bits).
If the Response / Request contains array elements,
the IND will carry the Array Subindex. If parameter
descriptions are involved, the IND will hold the Record
Subindex of the Parameter description.
RC content
Request Function
0Norequest
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
Re-
sponse
Function
0Noresponse
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 Spontaneous message (word)
10 Spontaneous message (long w ord)
11 Spontaneous m essage (array word)
12 Spontaneous message (ar ray long word)
13-15 Not used
If the slave rejects a request from the master, the
RC word in the PPO-read will indicate this by
assuming the value 7. The fault # will be carried
by bytes 7 and 8 in the PVA element.
Fault # Interpretation
0 Illegal PNU
1 Parameter value cannot be changed
2 Upper or lower limit exceeded
3 Subindex corrupted
4 No array
5Datatypefalse
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 av ailable
16 PPO-write missing
17 Request temporarily rejected
18 Other fault
19 Date 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
MG.90.A5.02 - VLT is a registered Danfoss trademark
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Danfoss FCM 300 Specifications

General

Brand	Danfoss
Model	FCM 300
Category	DC Drives
Language	English