Single Parameter Access (Spa) - Siemens HydroRanger 200 HMI Operating Instructions Manual

Single Parameter Access (SPA)

This section is intended to provide someone with advanced communications knowledge
the ability to access any parameter value in any available format.
Built in to HydroRanger 200 HMI is an advanced handshaking area that can be used to
read and write single registers to the HydroRanger 200 HMI. 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.
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 HydroRanger 200 HMI. 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
Reading parameters
To read parameters through Modbus, do the following steps:
1. Send the parameter, its primary index, and 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.
Page 274 HydroRanger 200 HMI – OPERATING INSTRUCTIONS
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
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