130BC198.10
Illustration 3.18 Mapping Input/Output Data in
Parameter 8-42 PCD Write Configuration
NOTICE
Gray lines are fixed, red are user-selectable.
Set up the following parameters in the frequency
converter:
130BC199.10
Illustration 3.19 Mapping Input/Output Data in
Parameter 8-43 PCD Read Configuration
NOTICE
The motor current in
parameter 16-14 Motor current
is 32
bit. This mapping is only mapping the lower 16 bit, so
the maximum motor current readout is 327 A.
For higher Amp readout, use 32-bit readout.
Mapping a 32-bit parameter as 16 bit always accesses the
16 lower bits.
3.8.11 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.
3.8.12 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 slave ID
11 hex
Read write multiple registers
17 hex
Table 3.15 Function Codes
Function
Function
code
Subfunctio
n code
Subfunction
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 slave error count.
14
Return slave message
count.
Table 3.16 Function Codes
3.8.13 Modbus Exception Codes
For a full explanation of the structure of an exception code
response, refer to
.
Code Name
Meaning
1
Illegal
function
The function code received in the query is
not an allowable action for the server (or
slave). This may be because the function
code is only applicable to newer devices,
and was not implemented in the unit
selected. It could also indicate that the
server (or slave) is in the wrong state to
process a request of this type, for example
because it is not configured and is being
asked to return register values.
2
Illegal data
address
The data address received in the query is
not an allowable address for the server (or
slave). More specifically, the combination
of reference number and transfer length is
invalid. For a controller with 100 registers,
a request with offset 96 and length 4
would succeed, a request with offset 96
and length 5 generates exception 02.
RS485 Installation and Set-...
Programming Guide
MG03N202
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Summary of Contents for VLT DriveMotor FCP 106
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