Siemens HydroRanger 200 HMI - Single Parameter Access (SPA); Mapping; Reading Parameters

Communications
C.41 Single parameter access (SPA)
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC
347
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
Description
40,090
Parameter (integer)
40,091 Primary index (integer)
40,092
Secondary index (integer)
40,093 Format word (bit mapped)
40,094
Read value, word 1
40,095
Read value, word 2
40,096
Write value, word 1
40,097
Write value, word 2
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.