Communication
70
Modbus/TCP
Register read and write
The drive parameter and data set information is mapped into a
4xxxx register area. This holding register area can be read from
an external device, and an external device can modify the register
values by writing to them.
There are no set-up parameters for mapping the data to the 4xxxx
register area. The mapping is predefined and corresponds directly
to the drive parameter grouping.
All mapped parameters are available for reading. The parameter
writes are verified for correct value, and for valid register
addresses. Some parameters never allow writing (e.g. actual
signals), some allow writing only when the drive is stopped (e.g.
set-up variables), and some can be modified at any time (e.g.
actual reference values).
Note: Some of the drive parameters are not accessible via
fieldbus. These are e.g. 32 bit parameters.
Register mapping
The drive parameters are mapped to the 4xxxx area as follows:
In this mapping, the thousands and hundreds correspond to the
group number, while the tens and ones correspond to the
parameter number within a group. Register addresses 4GGPP are
shown in the table below. In the table, GG represents the group
number while PP is the parameter index within the group.
40001…40096 are reserved for data sets
40101…49999 are reserved for parameters.
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