Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Uživatelský manuál stáhnout pdf (Strana 48)

100

101

Data Table

Chapter 3

321

The hardware-program interface is illustrated in Figure 3.7 by showing

the operational relationship between the input and output devices, the

input/output image table and the user program.

When an input device connected to terminal 113/12 is closed, the input

module circuitry senses a voltage. The On condition is reflected in the

input image table bit 113/12. During the program scan, the processor

examines bit 113/12 for an On (1) condition. If the bit is On (1), the

Examine On instruction is logically true. A true condition is displayed as

an intensified instruction. A path of logic continuity is established and

causes the rung to be true. The processor then sets output image table bit

012/06 to On (1). The processor turns on terminal 012/06 during the next

I/O scan and the output device wired to this terminal becomes energized.

When the rung condition is true, the output instruction is intensified.

3.3.3

Fundamental Operation

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