Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Pobierz pdf (Strona 661)

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L-force | PLC Designer

PLC Designer Libraries

 DMS 3.2 EN 02/2011 TD29 659

19.2 Util.lib library

This library contains an additional collection of various blocks which can be used for

BCD conversion, bit/byte functions, mathematical auxiliary functions, as controller,

signal generators, function manipulators and for analogue value processing.

As some of the functions and function blocks contain REAL variables, an accessory

library named UTIL_NO_REAL exists in which these POUs are excluded.

19.2.1 BCD Conversion

Provided by util.lib.

A byte in the BCD format contains integers between 0 and 99. Four bits are used for

each decimal place. The ten decimal place is stored in the bits 4-7. Thus the BCD

format is similar to the hexadecimal presentation, with the simple difference that

only values between 0 and 99 can be stored in a BCD byte, whereas a hexadecimal

byte reaches from 0 to FF.

An example: The integer 51 should be converted to BCD format. 5 in binary is 0101, 1

in binary is 0001, which makes the BCD byte 01010001, which corresponds to the

value $51=81.

BCD_TO_INT

Provided by util.lib.

This function converts a byte in BCD format into an INT value:

The input value of the function is type BYTE and the output is type INT.

Where a byte should be converted which is not in the BCD format the output is -1.

1 2 ... 656 657 658 659 660 661 662 663 664 665 666 ... 843 844

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