The PCD part responds according to the state and parame-
terization of the frequency converter.
PCV part response:
•
PCA: As the request telegram, but here the RC
part is taken from Table 5.16. 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: 03E8 hex in the PVA part tells that the value
of 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.
•
MAV: 2000 hex indicates that the output
frequency is 50% of the maximum reference.
Table 5.20 shows a negative response to the request
example from Table 5.18.
Byte Value
PCV
PCA 1 70
PCA 2 00
IND 3 00
IND 4 00
PVA 5 00
PVA 6 00
PVA 7 00
PVA 8 02
PCD
STW 9 0F
STW 10 07
MAV 11 20
MAR 12 00
Table 5.20 Response Example: Negative Response
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
Table 5.17.
5.4
PROFIBUS DP Parameter and Data Type
5.4.1 Parameter Description
PROFIBUS DP has a number of description attributes. Read/
write on parameter description is performed in the PCV
part using the RC commands 4 and 5, and the sub-index
of the desired description element.
5.4.2
Size Attribute
Find the size index and the conversion index for each
parameter from the parameter list in the respective
operating instructions. See also size and conversion indices
in Table 5.21.
Physical
quantity
Size
index
SI unit name SI unit
symbol
Conver-
sion
index
Conver-
sion
factor
0 No dimension
Time 4
second s 0 1
-1 0.1
-2 0.01
millisecond ms -3 0.001
minute min 70 60
hour h 74 3600
day d 77 86400
Energy 8
watthour Wh 0 1
kilowatthour kWh 3 1000
megawatthour MWh 6
10
6
Power 9
milliwatt mW -3 0.001
watt W 0 1
kilowatt kW 3 1000
megawatt MW 6
10
6
Rotation 11 rotation per
minute
RPM 67 1
Torque 16
newtonmetre Nm 0 1
kilonewtonmetre kNm 3 1000
Temperat
ure
17 degree Celsius ºC 0 1
Voltage 21
millivolt mV -3 0.001
volt V 0 1
kilovolt kV 3 1000
Current 22
milliampere mA -3 0.001
ampere A 0 1
kiloampere kA 3 1000
Resistance 23
milliohm mOhm -3 0.001
ohm Ohm 0 1
kiloohm kOhm 3 1000
Ratio 24 per cent % 0 1
Relative
change
27 per cent % 0 1
Frequency 28
hertz Hz 0 1
kilohertz kHz 3 1000
megahertz MHz 6
10
6
gigahertz GHz 9
10
9
Table 5.21 Size Index and Conversion Index
Parameter Access
Programming Guide
MG37G102 Danfoss A/S © Rev. 05/2014 All rights reserved. 31
5 5
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