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7ML19981FCO1 HydroRanger 200 – INSTRUCTION MANUAL Page 101

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Data Types

The HydroRanger 200 parameters do not always use integers to hold values. For the

convenience of the programmer, those values are converted to and from a 16-bit integer

number. This section describes the conversion process. The sections that follow describe

where those values are in the discrete I/O and block transfer addresses, and how to get

the parameters you need.

Numeric Values

Numeric parameter values are the most common. For example, parameter P920

(Reading) returns a number that represents the current reading (either level or volume,

depending on the HydroRanger 200 configuration).

Numeric values are requested or set in units or percent of span, and may be specified

with a number of decimal places.

Numeric values must be in the range –20,000 to +20,000 to be valid. If a parameter is

requested and its value is more than +20,000, the number 32,767 is returned; if it is less

than –20,000, the number –32,768 is returned. If this overflow happens, decrease the

number of decimal places.

If a parameter cannot be expressed in terms of percent of span, or has no meaningful

value, the number 22,222 is returned. Try requesting the parameter in units, or refer to

P005 in the

Parameter Reference

section on page 115.

Bit Values

Bits are packed into registers in groups of 16 bits (1 word). In this manual, the bits are

numbered from 1 to 16, with bit 1 as the least significant bit (LSB) and bit 16 as the most

significant bit (MSB).

Unsigned Double Precision Integer (UINT32)

Large numbers are put into unsigned 32 bit integers. By default, they are set up so that

the first word (register) is the most significant word (MSW) and the second word

(register) is the least significant word (LSW).

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

MSB LSB

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 255 256

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Siemens HydroRanger 200 Bedienerhandbuch Seite 115