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Chapter 7

Data Types

This chapter describes the data types and formats used by the BASIC

Module Data Conversion CALL routines. After reading this chapter you

should be able to interpret and manipulate the data values generated by

your module.

Converted data is exchanged with programmable controllers using

block-transfers. You can generate the following data types with the BASIC

Module:

16-bit binary (XXXX)

3-digit, signed, fixed decimal BCD (" XXX.)

4-digit, unsigned, fixed decimal BCD (XXXX.)

4-digit, signed, octal (" XXXX)

6-digit, signed, fixed decimal BCD (" XXXXXX.)

3.3-digit, signed, fixed decimal BCD (" XXX.XXX)

This value requires one word of the processor data table. The data is

represented by 16 straight binary bits (figure 7.1). The value ranges from 0

to 65,535. No sign, overflow or underflow bits are affected or decoded. If

you use a value larger than 65,535 or a negative number you get a BAD

ARGUMENT error.

Figure

7.1

16 Bit Binary W

ord (4 digit hex)

7.1

Chapter Objectives

7.2

Output Data Types

7.2.1

16-bit Binary (4 Hex Digits)

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 166 167

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manuale Utente Pagina 143