Communication Appendix A: Single Parameter Access (Spa); Mapping; Reading Parameters - Siemens HydroRanger 200 Instruction Manual

Communication Appendix A: Single
Parameter Access (SPA)
This Appendix is intended to provide someone with advanced communications
knowledge the ability to access any parameter value in any available format.
Built into HydroRanger 200 is an advanced handshaking area that can be used to read
and write single registers to the HydroRanger 200. 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. 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.
All parameters normally accessed through the hand-held programmer are available
through these registers.
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 112
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
HydroRanger 200 – INSTRUCTION MANUAL 7ML19985FC03