Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Instrukcja Użytkownika Pobierz pdf (Strona 128)

100

101

Data Manipulation Instructions

Chapter 6

66

Figure 6.6

GreaterThan

Comparison

||

()

120 010

| G |

100

030

| < |

YYY

031

Reference V

alue

When YYY>100, GET/LES comparison is true and 010/01 is energized.

Equal To – An equal-to comparison is made with the Get and Equ

instructions (Figure 6.7). The Get value is the changing variable and is

compared to the reference value of the Equ instruction for an equal-to

condition. When the Get value equals the Equ value, the comparison is true

and logic continuity is established.

Figure 6.7

EqualTo

Comparison

||

()

120 010

| G |

YYY

030

| = |

100

035

Reference V

alue

When YYY=100, GET/EQU comparison is true and 010/02 is energized.

Less Than or Equal To – This comparison is made using the Get, Les

and Equ instructions. The Get value is the changing value. The Les and

Equ instructions are assigned a reference value (Figure 6.8). When the

Get value is either less than or equal to the value at the Les and Equ

instructions, the comparison is true and logic continuity is established.

NOTE: Only one Get instruction is required for a parallel comparison. The

Les and Equ instructions are programmed on parallel branches.

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