Rockwell-automation 1791-XXXX Discrete I/O AC and DC Block I/O Input a Manual do Utilizador descarregar pdf (Página 66)

Configuring Your Block I/O for PLC

Family Programmable Controllers

Chapter 4

4-9

PLC-2 and PLC-5 family processors support a complementary I/O

configuration. Complementary I/O can allow you to maximize memory

usage without increasing memory size. Refer to the user’s manual for your

processor to see if it supports this type of configuration.

You configure complementary I/O by duplicating an I/O rack number of

one I/O chassis (primary) in another I/O chassis (complementary), I/O

group for I/O group. The I/O modules in the complementary chassis

perform the opposite function of the corresponding modules in the

primary chassis.

Important: Series A block I/O modules do not support complementary

I/O. If using complementary I/O, use series B modules.

When using I/O racks in a complementary configuration, the block I/O

must be paired with a device which occupies 1/4 rack of I/O space (i.e.

primary and complementary must be the same logical rack size).

Note: The 1747-SN series A is not capable of supporting

complementary I/O.

Figure 4.11

Processor

Data T

able Use with Complementary I/O

To Programmable Controller

or I/O Scanner Module

1 I/O Rack -

with

Complementary

I/O

10833I

16

or 32point

Output Block I/O

16 or 32point

Input Block I/O

16 or 32point

Input Block I/O

16 or 32point

Input Block I/O

16 or 32point

Input Block I/O

16 or 32point

Output Block I/O

16 or 32point

Output Block I/O

16 or 32point

Output Block I/O

Input Block and Output Block

on each pair have the same

logical address.

Install terminating resistor on last block.

Using Complementary I/O

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