Process Words (Pcd); Examples; Writing A Parameter Value; Reading A Parameter Value - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...
Conversion index
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
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
Control Message (master⇒follower Control
word)
Control Message (follower⇒master) Status
word
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 =0000 Hex
high
PWE =03E8 Hex - Data value 1,000, corresponding to 100
low
Hz, seechapter 10.7.12 Conversion.
MG34S222
Design Guide
Conversion factor
1000000
100000
10000
1000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
PCD 2
Reference value
Present output
frequency
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
E19E H 0000 H 0000
PKE IND PWE
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 0000 H 0000
PWE
PKE IND
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 =0000 Hex
high
PWE =0000 Hex
low
1155 H 0000 H 0000
PKE IND
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.
H 03E8 H
PWE
high low
H 03E8 H
PWE
low
high
H 0000 H
PWE PWE
high low
273
10 10