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Bus adress Bus register
1
PLC Register Content
Access
Description
0
1
40001
Reserved
Reserved for Legacy Drives VLT 5000 and VLT 2800
1
2
40002
Reserved
Reserved for Legacy Drives VLT 5000 and VLT 2800
2
3
40003
Reserved
Reserved for Legacy Drives VLT 5000 and VLT 2800
3
4
40004
Free
4
5
40005
Free
5
6
40006
Modbus conf
Read/Write
TCP only. Reserved for Modbus TCP (p12-28 and 12-29 -
store in Eeprom etc.)
6
7
40007
Last error code
Read only
Error code recieved from parameter database, refer to
WHAT 38295 for details
7
8
40008
Last error register Read only
Address of register with which last error occurred, refer
to WHAT 38296 for details
8
9
40009
Index pointer
Read/Write
Sub index of parameter to be accessed. Refer to WHAT
38297 for details
9
10
40010
FC par. 0-01
Dependent on
parameter access
Parameter 0-01 (Modbus Register=10 parameter number
20 bytes space reserved pr parameter in Modbus Map
19
20
40020
FC par. 0-02
Dependent on
parameter access
Parameter 0-02
20 bytes space reserved pr parameter in Modbus Map
29
30
40030
FC par. xx-xx
Dependent on
parameter access
Parameter 0-03
20 bytes space reserved pr parameter in Modbus Map
Table 7.17 Adress/Registers
1)
Value written in Modbus RTU telegram must be one or less than register number. E.g. Read Modbus Register 1 by writing value 0 in telegram.
7.8.9 How to Control the Frequency
Converter
This section describes codes which can be used in the
function and data fields of a Modbus RTU message.
7.8.10 Function Codes Supported by
Modbus RTU
Modbus RTU supports use of the following function codes
in the function field of a message.
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 counter
B hex
Report follower ID
11 hex
Table 7.18 Function Codes
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 communi-
cation error count
13
Return bus exception error
count
14
Return follower message
count
Table 7.19 Function Codes
RS-485 Installation and Set...
VLT
®
HVAC Basic Drive FC 101 Design Guide
90
MG18C502 - Rev. 2013-09-06
7
7
Содержание VLT HVAC Basic Drive FC 101
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