Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario descargar pdf (Pagina 124)

100

101

Data Manipulation Instructions

Chapter 6

62

The Get Byte and Limit Test instructions compare 3-digit values in octal

format using eight bits (one byte) of a data table word (Figure 6.2). This

3-digit value is an octal number ranging from 000

to 377

. Note that two

3-digit values can be stored in a word: one in the upper byte (bits 10-17)

and one in the lower byte (bits 00–07).

A Data Manipulation instruction can address any word in the data table,

excluding processor work areas.

Figure 6.2

Octal

Format

Upper Byte

Lower Byte

1001100111101111

Bits 0007 Contain Octal V

alue of Lower Byte.

Bits 1017 Contain Octal V

alue of Upper Byte.

357

There are three Data Transfer instructions. They are:

GET –|G|–

PUT –(PUT)–

GET BYTE –[B]–

Get instructions are programmed in the condition area of the ladder

diagram rung. They tell the processor to make a duplicate of all 16 bits

in the addressed memory word. When the rung containing the Get/Put

instructions goes true, the data is transferred to the word address of the Put

instruction (Figure 6.3).

6.1

Data Transfer Instructions

6.1.1

Get Instruction

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 345 346

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