Danfoss VLT Series Design Manual page 145

VLT ® HVAC Drive Design Guide
7.4.13. Process Words (PCD)
The block of process words is divided into two blocks of 16 bits, which always occur in the defined
sequence.
PCD 1
Control telegram (master⇒slave control word)
Control telegram (slave ⇒master) status word
7.5. Examples
7.5.1. Writing a parameter value
Change par. 4-14
Write the data in EEPROM.
PKE = E19E Hex - Write single word in par.
Motor Speed High Limit [Hz]
4-14
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, cor-
responding to 100 Hz, see Conversion.
Note: Parameter 4-14 is a single word, and the
parameter command for write in EEPROM is
"E". Parameter number 414 is 19E in hexa-
decimal.
The response from the slave to the master will
be:
7.5.2. Reading a parameter value
Read the value in par. 3-41
PKE = 1155 Hex - Read parameter value in
par. 3-41
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 0000 Hex
If the value in par. 3-41
s, the response from the slave to the master
will be:
Motor Speed High Limit [Hz]
Ramp 1 Up Time.
Ramp 1 Up Time
Ramp 1 Up Time
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
7. RS-485 Installation and Set-up
PCD 2
Reference value
Present output frequency
to 100 Hz.
The telegram will look like this:
is 10
7
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