Conversion index Conversion factor
100
75
74
67
6 1000000
5 100000
4 10000
3 1000
2 100
1 10
0 1
-1 0.1
-2 0.01
-3 0.001
-4 0.0001
-5 0.00001
-6 0.000001
-7 0.0000001
Table 10.7 Conversion Table
10.7.13
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 PCD 2
Control Message (master⇒follower Control
word)
Reference value
Control Message (follower⇒master) Status
word
Present output
frequency
Table 10.8 PCD Sequence
10.8
Examples
10.8.1 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
PWE
high
=0000 Hex
PWE
low
=03E8 Hex - Data value 1,000, corresponding to 100
Hz, seechapter 10.7.12 Conversion.
E19E H
PKE IND PWE
high
PWE
low
0000 H 0000 H 03E8 H
130BA092.10
Figure 10.11 Message
NOTICE!
4-14 Motor Speed High Limit [Hz] is a single word, and the
parameter command for write in EEPROM is “E.”
Parameter number 4–14 is 19E in hexadecimal.
119E H
PKE
IND
PWE
high
PWE
low
0000 H 0000 H 03E8 H
130BA093.10
Figure 10.12 Response from Master to Follower
10.8.2 Reading a Parameter Value
Read the value in 3-41 Ramp 1 Ramp-up Time
PKE=1,155 Hex - Read parameter value in 3-41 Ramp 1
Ramp-up Time
IND=0000 Hex
PWE
high
=0000 Hex
PWE
low
=0000 Hex
1155 H
PKE IND PWE
high
PWE
low
0000 H 0000 H 0000 H
130BA094.10
Figure 10.13 Parameter Value
If the value in 3-41 Ramp 1 Ramp-up Time is 10 s, the
response from the follower to the master is:
Figure 10.14 Response from Follower to Master
3E8 Hex corresponds to 1000 decimal. The conversion
index for 3-41 Ramp 1 Ramp-up Time is -2.
3-41 Ramp 1 Ramp-up Time is of the type Unsigned 32.
RS-485 Installation and Set...
Design Guide
MG34S222 Danfoss A/S © Rev. 2014-02-10 All rights reserved. 273
10 10
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