Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Instrukcja Użytkownika Pobierz pdf (Strona 40)

Fundamental Instruction Set

Chapter 5

53

reset to a 0. (From this point on, set means turned to the on-condition or 1.

Reset means turned to the off-condition or 0.)

If the device : The a bit in memory is:

on set

off reset

Recall that the controller scans the status of your inputs and controls your

output devices. It does not go to the input or output terminals to see if outputs

are on or off. Rather, it checks the status of the input and output devices by

scanning corresponding bits in memory. The controller uses addresses to refer

to memory bits.

Each input and output bit has a five-character address (Figure 5.1).

Figure 5.1

Instruction

Address T

erminology

10149-I

Concept Example

Hardware Terminology Hardware Terminology

Input (1) or Output (0)

Rack No. (1-7)

Module Group No.

(0-7)

Terminal No.

(00-07, 10-17)

Output 0

Rack No.: 1

Module Group No.: 0

Terminal No.: 12

X X / XXX

Word

Data Table Terminology

Address

Bit

Address

Instruction Address

0 0 / 121

Word

Address

Bit

Address

Reading from left to right:

The first number denotes the type of word corresponding to a module:

0 output

1 input

NOTE: Remember, there is only 1 rack in a Mini-PLC-2/15 system.

Address

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 214 215

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