Rockwell-automation 2711 PANELBUILDER SOFTWARE USER MANUAL Manual de usuario descargar pdf (Pagina 92)

100

101

Planning Your Application

Chapter 4

4-17

Binary—when you select the binary data type, the object’s PLC address

will be a contiguous bit string 1 to 16 bits long. The range of values you

can access will depend on the number of bits you assign. You can

position a binary data address anywhere within a PLC word (any ”start

bit”). It is possible for the binary data address to extend into the next

word, but not past the end of a rack assignment or block transfer file.

The remaining bits in that word, on either side of the binary data

address, can be used for other PLC data types.

Table 4.F

Number

of States Supported by Specific Number of Bits for Binary Data T

ypes

Number of Binary States Bits Required

1-2 1

3-4 2

5-8 3

9-16 4

17-32 5

33-64 6

65-128 7

129-256 8

257-512 9

513-1024 10

1025-2048 11

2049-4096 12

4097-8192 13

8193-16384 14

16385-32768 15

32769-65536 16

Signed Integer always occupies one 16-bit word. Positive integers are

stored in straight binary format while negative integers are stored in

two’s complement format. The range of data values is from –32,768 to

+32,767.

BCD (Binary Coded Decimal)—if you select the BCD data type, the

object’s PLC control word will be a contiguous bit string of either 4, 8,

12, 16, 20, 24, 28, or 32 bits. The exact number of bits required will

depend on the maximum value required for the object. The first bit in a

BCD bit string can be aligned on any bit in a PLC word, but you would

typically use bit zero. It is possible for the BCD bit string to extend into

the next word, but not past the end of a rack assignment or block

transfer file.

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 467 468

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