GE GFK0579B 用户手册

When the programmer communicates directly with the remote drop, the Logicmaster
reference tables display the Remote I/O Scanner’s internal %I, %Q, %AI, %AQ,  %R,
%S, %SA, %SB, and %SC memories.

I/O data in the Remote I/O Scanner’s %I, %AI. %Q, and %AQ tables corresponds to
discrete and analog I/O cards in the remote drop, and/or data being manipulated by
option modules.  Any other memory locations in these tables are zero.  Data from these
tables is exchanged with the host CPU according to the Remote I/O Scanner’s
configured I/O map. Viewing the equivalent table in the PLC shows the Remote I/O
Scanner ’s mapped data plus data for all other modules in the PLC system.

The Remote I/O Scanner’s %R reference table will not contain any data unless its %R
memory is being used by option modules in the remote drop.  Such %R data is not
exchanged with the host.

PLC 

references

 

not 

displayed 

at 

Remote 

I/O 

Scanner

The %S, %SA, %SB, and %SC reference tables show the current states of the Remote
I/O Scanner’s predefined status bits.  These are the same as the status bits defined for
the Series 90–70 PLC.  For more information about the status bits, see chapter 8.