Danfoss VT2800 Series Design Manual page 112

Example - Write a parameter value:
Parameter 202 Output frequency high limit, f
be changed to 100 Hz. The value must be recalled
after a mains failure, so it is written in EEPROM.
PKE = E0CA Hex - Write for parameter 202
Output frequency high limit, f
IND = 0000 Hex
PWE = 0000 Hex
HIGH
PWE = 03E8 Hex - Data value 1000,
LOW
corresponding to 100 Hz, see conversion.
The response from the slave to the master will be:
Example - Selection of a data value:
You wish to select kg/hour [20] in parameter 416
Process units. The value must be recalled after a
mains failure, so it is written in EEPROM.
PKE = E19F Hex - Write for parameter
416 Process units
IND = 0000 Hex
PWE = 0000 Hex
HIGH
PWE = 0014 Hex - Select data option
LOW
kg/hour [20]
The response from the slave to the master will be:
Example - Reading a parameter value:
The value in parameter 207 Ramp up time 1 is required.
The master sends the following request:
PKE = 10CF Hex - read parameter 207
Ramp up time 1
IND = 0000 Hex
PWE = 0000 Hex
HIGH
PWE = 0000 Hex
LOW
112
to
MAX
MAX
Process Words
®
VLT 2800 Series
If the value in parameter 207 Ramp-up time 1 is 10
sec., the response from the slave to the master will be:
Conversion:
Under the section entitled Factory Settings the
various attributes of each parameter are displayed.
As a parameter value can only be transferred
as a whole number, a conversion factor must
be used to transfer decimals.
Example:
Parameter 201 Output frequency, low limit f
a conversion factor of 0.1. If you wish to preset the
minimum frequency to 10 Hz, the value 100 must
be transferred, as a conversion factor of 0.1 means
that the value transferred is multiplied by 0.1. The
value 100 will thus be percei v ed as 10.0.
Conversion table
Conversion
index
73
2
1
0
-1
-2
-3
-4
-5
The block of process words is di v ided into two blocks
of 16 bits, which always occur in the defined sequence.
PCD 1
Control telegram Control word
(master⇒slave)
Control telegram Status word
(slave⇒master)
MG.28.E9.02 - VLT is a registered Danfoss trademark
has
MIN
Conversion
factor
0.1
100
10
1
0.1
0.01
0.001
0.0001
0.00001
PCD 2
Reference-
value
Present outp.
frequency