Siemens SIMATIC S7-1200 Handbuch - Seite 19

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3 Mode of Operation

With read access, the read data are successively ("RegisterIndex") written into the

corresponding register file ("Index") of the addressed fan depending on the access

mode:



Interface parameter "holding" for the holding registers ("mode" = 0)



Interface parameter "input" for the input registers ("mode" = 104)

If necessary, the read value ("uint") is subsequently converted into the

corresponding floating point value ("real") depending on the calculation instruction

("calc").

With write access ("write.req"), the entered floating point value ("real") is converted

into the corresponding data value in the format "UInt" if necessary and

subsequently written into the data buffer "dataPtr" of the Modbus_Master and

transmitted to the fans ("write.fanRange.start" bis "write.fanRange.end") based on

the calculation instruction ("calc").

As the only exception, the holding register "Password" to write to has a length of

3 words (see

elements are transmitted ("dataPtr [0..2] = uint [0..2]").

Controlling several fans (ebm-papst) via Modbus RTU

Entry ID: 109476801,

V2.0,

Table

3-1). Here, the first and additionally the two following field

09/2018