Supported Data Types; Conversion; Process Words (Pcd); Examples - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...
Illustration 10.10 Text via PWE Block

10.6.11 Supported Data Types

Unsigned means that there is no operational sign in the
telegram.
Data types
3
4
5
6
7
9
10
13
33
35
Table 10.7 Supported Data Types
10 10

10.6.12 Conversion

The various attributes of each parameter are displayed in
Factory Setting. Parameter values are transferred as whole
numbers only. Conversion factors are therefore used to
transfer decimals.
4-12 Motor Speed Low Limit [Hz] has a conversion factor of
0.1. To preset the minimum frequency to 10 Hz, transfer
the value 100. A conversion factor of 0.1 means that the
value transferred is multiplied by 0.1. The value 100 is
therefore read as 10.0.

Examples:

0s ⇒ conversion index 0
0.00s ⇒ conversion index -2
0ms ⇒ conversion index -3
0.00ms ⇒ conversion index -5
186
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PKE IND PWE
high
Read text Fx xx 04 00
Write text Fx xx 05 00
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Byte string
Time difference
Reserved
Bit sequence
MG33BE02 - VLT
®
VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
Conversion index
PWE
low
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 10.8 Conversion Table

10.6.13 Process Words (PCD)

The block of process words is divided into two blocks of
16 bits, which always occur in the defined sequence.
Control telegram (master⇒ slave Control
word)
Control telegram (slave⇒ master) Status word Present output
Table 10.9 Process Words (PCD)
10.7 Examples

10.7.1 Writing a Parameter Value

Change 4-14 Motor Speed High Limit [Hz] to 100 Hz.
Write the data in EEPROM.
PKE = E19E Hex - Write single word in 4-14 Motor Speed
High Limit [Hz]
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, corresponding to
100 Hz, see 10.6.12 Conversion.
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Conversion factor
1000000
100000
10000
1000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
PCD 1
Reference-value
frequency
PCD 2