3

I/O Scanner Memory

The Remote I/O Scanner has %I, %AI, %Q, %AQ, and %R internal memories. The following table shows how much memory of each type the Remote I/O Scanner has, and the maximum amount that may be transferred with the host.

Memory Type

References Available in

Transferred with Host

 

Remote I/O Scanner

 

%I

12K

up to 1024 bits

%Q

12K

up to 1024 bits

%AI

8K

up to 64 words

%AQ

8K

up to 64 words

%R

16K

not transferrable

I/O Memory in the Remote I/O Scanner

The Remote I/O Scanner's %I, %AI, %Q, and %AQ memories are used for the remote drop's I/O data. They can also be used for data being transferred between the host and option modules in the remote drop.

Individual I/O modules may be configured anywhere within available memory. If data are to be exchanged with the CPU, the modules must be placed inside the configured I/O map. Any I/O modules configured outside the I/O map will be scanned by the Remote I/O Scanner, but the data will not be derived from or supplied to the CPU.

Configuring I/O References in a Series 90±70 PLC Application

When configuring I/O references for a Series 90±70 PLC:

1.A Logicmaster 90 program folder for the Series 90±70 contains the I/O map for each remote drop.

2.A Logicmaster 90 program folder for a Remote I/O Scanner also contains an I/O map.

3.For 90±70 applications, it recommended that both of these I/O maps agree.

4.The configured data lengths must agree.

For most applications, matching PLC and Remote I/O Scanner references are recommended to avoid confusion. However, it is not mandatory to assign the same references in the Remote I/O Scanner configuration and in the PLC configuration.

%R Memory in the Remote I/O Scanner

The Remote I/O Scanner has 12K bytes of %R memory that is not used for data transfer with the host. However, it is available for other uses such as transferring data with Programmable Coprocessor Modules in the remote drop.

Chapter 3 Remote I/O Scanner Operation

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GE GFK0579B user manual Scanner Memory, Memory in the Remote I/O Scanner
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GFK0579B specifications

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