Single Parameter Access (Spa); Mapping; Reading Parameters - Siemens HydroRanger 200 HMI Operating Instructions Manual

C.41

Single parameter access (SPA)

This section is intended to provide someone with advanced communications knowledge and
the ability to access any parameter value in any available format.
Built in to the device is an advanced handshaking area that can be used to read and write
single registers to the device. This section performs a similar function to the Parameter
access section. The differences are:
1. Advanced section is more powerful and harder to program.
2. Advanced section only gives you access to one parameter at a time.
C.41.1

Mapping

Parameter Read and Write (40,090 – 40,097) is a series of eight registers used for reading
and writing parameter values to and from the device. The first three registers are always
unsigned integers representing parameters and index values. The second five registers are
the format and value(s) of the parameter.
Address
40,090
40,091
40,092
40,093
40,094
40,095
40,096
40,097
C.41.2

Reading parameters

To read parameters through Modbus, do the following steps:
1. Send the parameter, its primary index, its secondary index (usually 0), and format to
registers 40,090 to 40,093.
2. Wait until you can read the written values from the registers (40,090 to 40,093) to confirm
that the operation is complete.
3. Read the value from registers 40,094 and 40,095.
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC
C.41 Single parameter access (SPA)
Description
Parameter (integer)
Primary index (integer)
Secondary index (integer)
Format word (bit mapped)
Read value, word 1
Read value, word 2
Write value, word 1
Write value, word 2
Communications
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