Danfoss VLT Refrigeration Drive FC 103 Design Manual page 83

System Integration
Coil 0
33 Control not ready
34 Frequency converter not
ready
35 Coasting stop
36 No alarm
37 Not used
38 Not used
39 Not used
40 No warning
41 Not at reference
42 Hand mode
43 Out of frequency range
44 Stopped
45 Not used
46 No voltage warning
47 Not in current limit
48 No thermal warning
Table 3.36 Frequency Converter Status Word (FC Profile)
Register Description
number
00001–00006 Reserved
00007 Last error code from an FC data object interface
00008 Reserved
00009 1)
Parameter index
00010–00990 000 parameter group (parameters 0-01 through
0-99)
01000–01990 100 parameter group (parameters 1-00 through
1-99)
02000–02990 200 parameter group (parameters 2-00 through
2-99)
03000–03990 300 parameter group (parameters 3-00 through
3-99)
04000–04990 400 parameter group (parameters 4-00 through
4-99)
... ...
49000–49990 4900 parameter group (parameters 49-00 through
49-99)
50000 Input data: Frequency converter control word
register (CTW).
50010 Input data: Bus reference register (REF).
... ...
50200 Output data: Frequency converter status word
register (STW).
50210 Output data: Frequency converter main actual
value register (MAV).
Table 3.37 Holding Registers
1) Used to specify the index number to be used when accessing an
indexed parameter.
MG16G202
Design Guide
1
Control ready
Frequency converter ready
Safety closed
Alarm
Not used
Not used
Not used
Warning
At reference
Auto mode
In frequency range
Running
Not used
Voltage warning
Current limit
Thermal warning
Danfoss A/S © 08/2015 All rights reserved.
3.9.10.9 How to Control the Frequency
Converter
Codes available for use in the function and data fields of a
Modbus RTU message are listed in
chapter 3.9.10.10 Function Codes Supported by Modbus RTU
and chapter 3.9.10.11 Modbus Exception Codes.
3.9.10.10 Function Codes Supported by
Modbus RTU
Modbus RTU supports use of the function codes (see
Table 3.38) in the function field of a message.
Function
Read coils
Read holding registers
Write single coil
Write single register
Write multiple coils
Write multiple registers
Get communication event counter
Report slave ID
Table 3.38 Function Codes
Function Function Subfunction
code code
Diagnostics 8 1
2
10
11
12
13
14
Table 3.39 Function Codes and Subfunction Codes
Function code (hex)
1
3
5
6
F
10
B
11
Subfunction
Restart communication
Return diagnostic register
Clear counters and
diagnostic register
Return bus message
count
Return bus communi-
cation error count
Return slave error count
Return slave message
count
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