Modbus RTU RS-485
13
SFIDK.PS.023.D2.02
6.
Modbus holding
registers
In the following the
holding registers
for the USM II Modbus RTU module are described.
The minimum value of a writable „
holding register
“ value can be read by adding 10000 to the
address of the value.
The maximum value of a writable „
holding register
“ value can be read by adding 20000 to the
address of the value.
Where the value is not directly applicable, the min./max. limit shown will be based on the data
type -
e.g. a „WORD-type“ value will show the limits 0-65535
- even though some of these values
are not allowed.
Min./max. values do not apply to all datatypes (e.g. strings). Reading min./max. value for such
„
holding registers
“ will return zero-values.
Figure:
Holding registers memory map
Comm. settings
Info/status
Application settings
Min. values
Max. values
0
600
500
700
2000
3300
10000
20000
30000
65535
6.
Modbus holding registers
