Siemens HydroRanger 200 Manual de instrucciones descargar pdf (Pagina 122)

Page 108 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FCO1

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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 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.

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.

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

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 255 256

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Siemens HydroRanger 200 Manual de instrucciones Pagina 122