Function Codes Supported By Modbus Rtu - Danfoss VLT AQUA Drive FC 202 Design Manual

RS-485 Installation and Set...
Register Number Description
00001-00006 Reserved
00007 Last error code from an FC data object interface
00008 Reserved
00009 Parameter index*
00010-00990 000 parameter group (parameters 001 through 099)
01000-01990 100 parameter group (parameters 100 through 199)
02000-02990 200 parameter group (parameters 200 through 299)
03000-03990 300 parameter group (parameters 300 through 399)
04000-04990 400 parameter group (parameters 400 through 499)
... ...
49000-49990 4900 parameter group (parameters 4900 through 4999)
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 7.15 Holding Registers
* Used to specify the index number used when accessing an indexed parameter.
7.8.9 Function Codes Supported by
Modbus RTU
Modbus RTU supports use of the function codes in
Table 7.17 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 comm. event counter
Report slave ID
Table 7.16 Function Codes
Function Function Sub-
code function
code
Diagnostics 8 1
2
10
11
12
13
14
Table 7.17 Function Codes
®
VLT AQUA Drive FC 202 Design Guide
Function code
1 hex
3 hex
5 hex
6 hex
F hex
10 hex
B hex
11 hex
Sub-function
Restart communication
Return diagnostic register
Clear counters and
diagnostic register
Return bus message count
Return bus communication
error count
Return bus exception error
count
Return slave message
count
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