Rockwell-automation 2707-NP DTAM Programming Software Uživatelský manuál stáhnout pdf (Strana 175)

Appendix D

Data Formats

D–5

32 Bit Floating Point (PLC Controllers Only)

Floating Point

(Two Consecutive 16 Bit addresses)

Range = ±1.2E-38 to ±3.4E +38

Bit

Exponent Mantissa

Bit

This data format displays data located in two consecutive 16 bit addresses as

a 32 bit floating point value. Floating points use a memory register plus the

next higher register to form the 32 bit address. The range for the floating

point value is +

1.175495E

-38

to +3.402823E

+38

Note: The floating point format adheres to the ANSI/IEEE 754 standard.

This data format may be scaled to different engineering units.

The DTAM Micro Operator Interface Module now supports floating point

numeric entry and display.

Floating point display is controlled by the value of the Decimal Opt

parameter. The value can be either 0 or 1. If Decimal Opt=0, the display

width is set to 10 characters (including the decimal point), and the decimal

point can float anywhere within that width. If Decimal Opt=1, then you

have the option of setting the display from 2 to 8 characters wide (including

decimal), and the decimal point will always appear at a fixed position you

select.

The module can display floating point numbers up to 8 characters long (7

digits plus decimal point). However, you can enter numbers up to 13 digits

long. Any time you enter a number between 7 and 13 digits long it will be

stored internally as an exponential value. For example:

Table 1

How the DTAM Micro stores input

Entered Number

Number Stored Internally

1234567 1234567

12345678 1.234568E+07*

–1234567 –1234567

1234567890123 1.234568E+12*

* Note rounding

The module’s firmware will not display numbers in exponential form. Nor

will it allow you to enter numbers longer than 13 digits.

DTAM Micro

Floating Point Numbers

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 183 184

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