Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 107)

100

101

Chapter

Data

Types

8 -7

6-Digit, Signed, Fixed Decimal BCD

This value requires two words of the processor data table. The first word

contains overflow, underflow and sign data and the three most significant

digits of the 6-digit BCD integer. The second word contains the lower

three digits of the value. The value ranges from –999999 to +999999.

If an overflow or underflow condition exists, the appropriate bit is set and

a value of 000000 is reported. Fractional portions of any number used

with this routine are truncated. See CALL 13 (page 12 -8) and CALL 23

(page 12 -14).

17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

not used

underflow bit (1 = value is fractional and between +1 & –1

(ie. +.999 to –.999)

sign bit (1 = negative; 0 = positive)

overflow bit (1 = value > +999999)

Upper Half BCD Value

15035

D6 D5 D4

Word 1

–

17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

D3 D2 D1

Word 2

Lower Half BCD Value

not used

implied

decimal point

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 393 394

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