Siemens HydroRanger 200 Manual de instrucciones descargar pdf (Pagina 123)

7ML19981FCO1 HydroRanger 200 – INSTRUCTION MANUAL Page 109

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Communication Appendix A

Writing Parameters

To set parameters through Modbus do the following steps:

1. Send the parameter, its primary index, and its secondary index (usually 0) to

registers 40,090, 40,091, and 40,092.

2. Write the value to registers 40,096 and 40,097.

3. Write the desired format word to register 40,093 to enable the HydroRanger 200 to

interpret the value correctly.

Format Register

For example, to format the level reading so that it is shown in percent with two decimal

places shifted left, the format bits would look like this:

The value sent to the HydroRanger 200 is 0001001000000000 binary or 512 decimal. The

value 512 is sent as an integer to register 40,093 to format the output words 40,094 and

40,095 accordingly.

If the numeric data type is set for integer and the value contains decimal places, they are

ignored. In this situation, use the decimal offset to ensure that you have an integer value

and then write your code to recognize and handle the decimal offset.

Bits Values Description

1-8 0-2 Error Code

9-11 0-7 3-bit number representing decimal offset

12 0/1 direction of offset (0 = right, 1 = left)

13 0/1 Numeric format: Fixed (0) or Float (1)

14 0/1 Read or Write of data, Read (0), Write (1)

15 0/1 Word order: Most Significant Word first (0), Least

Significant Word first (1)

16 Reserved

Bit

Numbers

16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01

Bit Values 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0

reserved

most significant first

read

fixed format

offset direction to right

decimal offset of 2

no error code

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 255 256

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Siemens HydroRanger 200 Manual de instrucciones Pagina 123