Number of registers
This field is used for saving the 32-bit parameter values.
Parameter values with decimal places are transferred without decimal point. Depending
on the number of decimal places, the values are multiplied by 10, 100 or 1000.
Example:
A frequency value of 100.25 Hz is to be transferred. The actually transferred numerical value is 10025,
i.e. 0x2729in the hexadecimal system.
Exception condition code
The following exception condition codes are possible:
2 INVALID DATA ADDRESS • Parameter unknown
3 INVALID DATA VALUE • Number of bytes in data field too small or too high
4 SLAVE DEVICE ERROR • Error when reading parameters
For a description of the exception condition codes, refer to Chapter 7.2.9 “Exception condition codes”.
For an example of a Modbus RTU telegram, refer to Chapter 9.2.3.
7.2.6 Function code 101 (=0x65), write 32-bit parameter
Request:
Start address (dataset / para. no.)
Register value (parameter value)
Response:
Start address (dataset / para. no.)
Register value (parameter value)
Exception condition response:
Start address
This field is used for saving the parameter number and dataset number. The parameter number is in
the range between 0 and 1599 and is saved in the 12 least significant bits. The dataset number is in
the range between 0 and 9 and is saved in the 4 most significant bits.
34
ACU
Modbus/TCP 10/13
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