Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario descargar pdf (Pagina 310)

Addressing

Appendix A

A3

The processor addresses two I/O module slots as one I/O group.

Each physical 2-slot I/O group is represented by a word in the input

image table and a word in the output image table. Each input terminal

corresponds to a bit in the input image table word and each output terminal

corresponds to a bit in the output image table word.

The maximum number of bits available for one 2-slot I/O group is 32: 16

bits in the input image table word and 16 bits in the output image table

word. The type of discrete I/O module you install, either 8-point (standard

density) or 16-point (high-density, used in complementary mode)

determines the number of bits in the words that are used.

You select 2-slot addressing by setting two switches in the I/O chassis

backplane switch assembly. See your scanner’s or adapter’s users’ manual

for the specific switches and their settings.

Using 8Point I/O Modules

I/O modules generally provide eight input terminals or eight output

terminals. Figure A.2 illustrates the 2-slot I/O group concept with two

8-point input modules. Figure A.3 illustrates the 2-slot I/O group concept

with an 8-point input and an 8-point output module.

A.2.1

2Slot Addressing

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Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario Pagina 310