Data types supported by frequency transformer:
Data types
Description
3
Integer 16
4
Integer 32
5
Unsigned 8
6
Unsigned 16
7
Unsigned 32
9
Text string
Unsigned means that there is no operational sign in the telegram.
Example - Write a parameter value:
Parameter 202
Output frequency high limit, f
MAX
to 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
MAX
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 03E8 Hex - Data value 1000, 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
HIGH
= 0000 Hex
PWE
LOW
= 0014 Hex - Select data option 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
HIGH
= 0000 Hex
PWE
LOW
= 0000 Hex
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 deci-
mals.
Example:
Parameter 201
Output frequency, low limit f
MIN
has 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 perceived
as 10.0.
3 Programming
VLT® Decentral FCD
72
MG.04.B8.02 - VLT is a registered Danfoss trademark
3
