Siemens 200 instruction manual Writing Parameters, Format Register, Bits Values Description

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 MultiRanger to interpret the value correctly.

Format Register

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

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:

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

The value sent to the MultiRanger 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.

Communication Appendix A

7ML19981FB06 MultiRanger 100/200 – INSTRUCTION MANUAL Page 115