Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 77)

Advanced Instruction Set

Chapter 6

620

SECTION D

Advance Data Manipulation

This section describes ways to transfer file data to another designated area. In

this section you will read about:

Files

Data monitor mode display

Data transfer file instructions

Sequencer instructions

Chapter 10 demonstrates the programming techniques when using advanced

data manipulation instructions.

A file is a group of consecutive data table words used to store information. A

file is defined by a counter and a starting word address. the counter has two

functions:

Defines the file length with its preset value.

Points to a particular word in a file with its accumulated value.

The counter address is the file instruction’s address. The processor uses this

address to search for the instruction.

A file can be between 1 and 999 words in length. The address of word 1

defines the address of the file. When displayed, the words of a file are

designated consecutively by positions 001-999 according to the length of the

file.

The word address defines:

The location in the data table to which or from which the data will be moved.

This word address can be manipulated by ladder diagram logic.

There are two types of file instructions. Those that have an externally indexed

counter and those that have an internally indexed counter. The two file

instructions that have an externally indexed counter are: Word-to-file move, and

File-to-word move. The file instruction that has an internally indexed counter

is: File-to-file. Figure 6.10 shows the difference in format between these two

types of file instructions.

What is a File?

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 77