Siemens 200 Mapping, Reading Parameters, Communication Appendix a, Address Description

Communication Appendix A

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 MultiRanger is an advanced handshaking area that can be used to read and write single registers to the MultiRanger. 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 MultiRanger. 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	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

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.

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