Danfoss FC 300 Profibus Manual page 55

FC 300 Profibus
The process data within the PCD part acts
immediately upon the frequency converter, and
can be updated from the master as quickly as
possible. The PCV part is a "handshake" procedure
which means that the frequency converter has to
acknowledge the command, before a new one can
be written.
A positive response to the above example may look
like this:
The PCD part responds according to the state and parameterisation of the frequency converter.
The PCV part responds as:
PCA: As the request telegram, but here the RC part is taken from the response table, see the PCA handling
section. In this example RC is 2 Hex, which is a confirmation that a parameter value of the type long word
(32 bit) has been transferred. IND is not used in this example.
PVA: 03E8Hex in the PVA part tells that the value of par. 3-41 Ramp 1 ramp up time is 1000, which
corresponds to 10.00.
STW: 0F07 Hex means that the motor is running and there are no warnings or faults (for details see the
Status word table in the Status word section).
MAV: 2000 Hex indicates that the output frequency is 50% of the maximum frequency.
A negative response may look like this:
RC is 7 Hex, which means that the request has been rejected, and the fault number can be found in the
PVA part. In this case the fault number is 2, which means that the upper or lower limit of the parameter is
exceeded. See the fault number table in the PCA handling section.
How to Access FC 300 Parameters
MG.33.C2.02 - VLT is a registered Danfoss trademark
Byte
PCA 1
PCA 2
IND 3
IND 4
PCV
PVA 5
PVA 6
PVA 7
PVA 8
STW 9
STW 10
PCD
MAV 11
MAR 12
Byte
PCA 1
PCA 2
IND 3
IND 4
PCV
PVA 5
PVA 6
PVA 7
PVA 8
STW 9
STW 10
PCD
MAV 11
MAR 12
Value
20
CF
00
00
00
00
03
E8
0F
07
20
00
Value
70
00
00
00
00
00
00
02
0F
07
20
00
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