Holding registers
Register Number Description
00001-00006
Reserved
00007
Last error code from an FC data object interface
00008
Reserved
00009
Parameter index*
00100-00999
000 parameter group (parameters 001 through 099)
01000-01999
100 parameter group (parameters 100 through 199)
02000-02999
200 parameter group (parameters 200 through 299)
03000-03999
300 parameter group (parameters 300 through 399)
04000-04999
400 parameter group (parameters 400 through 499)
...
...
49000-49999
4900 parameter group (parameters 4900 through 4999)
500000
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).
* Used to specify the index number to be used
when accessing an indexed parameter.
7.8.9. How to Control VLT HVAC
This section describes codes which can be
used in the function and data fields of a Mod-
bus RTU message. For a complete description
of all the message fields please refer to the
section
Modbus RTU Message Framing Struc-
ture.
7.8.10. Function Codes Supported by Modbus RTU
Modbus RTU supports use of the following
function codes in the function field of a mes-
sage:
Function
Function
Code
Read coils
1 hex
Read holding registers
3 hex
Write single coil
5 hex
Write single register
6 hex
Write multiple coils
F hex
Write multiple registers 10 hex
Get comm. event coun-
ter
B hex
Report slave ID
11 hex
Function
Function Code
Sub-function
code
Sub-function
Diagnostics
8
1
Restart communication
2
Return diagnostic register
10
Clear counters and diagnostic register
11
Return bus message count
12
Return bus communication error count
13
Return bus exception error count
14
Return slave message count
7. RS-485 Installation and Set-up
VLT
®
HVAC Drive Design Guide
138
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
7
Содержание VLT series
Страница 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...
Страница 120: ...7 RS 485 Installation and Set up VLT HVAC Drive Design Guide 120 MG 11 B2 02 VLT is a registered Danfoss trademark 7...
Страница 152: ...8 Troubleshooting VLT HVAC Drive Design Guide 152 MG 11 B2 02 VLT is a registered Danfoss trademark 8...