Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 31)

Memory Organization

Chapter 4

42

Figure 4.1

Word

Address Equals Memory Bits

10146-I

Concept Example

Hardware Terminology Hardware Terminology

Input (1) or Output (0)

Rack No. (Always 1)

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

Hardware

vs. Your Program

I/O Terminal Bit

Module Group Word

Module Slot Byte

One Rack Eight Words

If the terminal has voltage (on state) A specific bit will be on and a 1 will be written in

memory

If the terminal has no voltage (off state) A specific bit will be off and a 0 will be written in

memory.

Now we will show you how to calculate the input and output image tables’

areas and how these values compare with the hardware of your system.

Remember: 1 rack - 8 words

You can only have one rack in this system.

Therefore: 8 words/rack x 16 bits - 128 I/O

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 214 215

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