GE GFK0579B 用户手册

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.

%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

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.

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.

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.