Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Uživatelský manuál stáhnout pdf (Strana 94)

Advanced Instruction Set

Chapter 6

637

Table 6.C

Timer/Counter

Block T

ransfer Analogy

Timer/Counter Equals Block Transfer Analog

Address of Accumulated Value Data Address of Instruction

Accumulated Value in BCD Module Address in BCD

Address of Preset Value 100

Above Data Address

Preset Value in BCD File Address in BCD

After locating the file address in the data table, the processor then duplicates

and transfers the file data consecutively one word at a time until complete,

starting at the selected file address.

At the completion of the transfer, a done bit for the read or write operation is set

in the input image table byte as a signal that a valid transfer has been

completed.

The format of a block transfer read and a block transfer write instruction with

default values is shown in Figure 6.15. An example of a program using these

instructions will be illustrated in chapter 11.

Let’s look at the instruction:

Block Transfer Syntax

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Uživatelský manuál Strana 94