Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Instrukcja Użytkownika Pobierz pdf (Strona 52)

Fundamental Instruction Set

Chapter 5

515

Figure 5.5

Get

and Put

110

PUT

030

238

110

238

Put

Symbol: -(PUT)-

Purpose: Receives 16 bits of data from the immediately preceding get

instruction and stores the data at the specified data table word location. Used

with a get instruction to form a data transfer rung.

Syntax: Programmed in the output side of the ladder diagram rung

(Figure 5.5). This instruction can have the same address as other instructions in

the program. It is always programmed with a get instruction.

Function: Transfers an image of the 16 bits of one data table word to another

data table word when the rung is true.

NOTE: The put instruction acts only upon true rung conditions. There should

be no instructions between the get and put instructions. Position all conditions

before the get instruction.

Equal

Symbol: -|=|-

Purpose: Compares the data in your specified address with data stored at

another address in memory. It determines the rung condition.

Syntax: Programmed after the get instruction in the condition side of the ladder

diagram rung (Figure 5.6).

Function: The rung condition becomes:

True

If there is equality.

False

If there is not equality.

Figure 5.6

Equal

To Comparison

When YYY = 100, GET/EQU comparison is true and 01002 is energized.

120

010

130

YYY

035

100

Reference Value

Compare Instructions

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 214 215

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