Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario descargar pdf (Pagina 315)

Addressing

Appendix A

A8

The processor (by way of the adapter) addresses one I/O module slot as

one I/O group.

Each 1-slot I/O group is represented by a word in the input image table and

a word in the output image table. You have 16 input bits and 16 output bits

available for each slot. This lets you use any mix of 8 and 16-point I/O

modules in the I/O chassis in any order. Thirty-two-point modules must be

used in complementary arrangements.

You select 1-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.

The physical address of each I/O group corresponds to an input and an

output image table word. The type of module you install (either 8-point or

16-point I/O) determines the number of bits in these words that are used.

Figure A.6 (on the next page) illustrates the 1-slot I/O group concept with

one 16-point I/O module. This module group uses an entire word of the

image table. You can use an 8-point I/O module with 1-slot addressing, but

the module uses only eight bits of the I/O image table word (8 bits in the

I/O image table are unused).

A.2.2

1Slot Addressing

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Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario Pagina 315