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51Chapter 3 Remote I/O Scanner Operation
Sending Data from an Option Module to the Host
To send data to the host CPU, the option module must place that data into the %I or
%AI memory area of the Remote I/O Scanner. The data must be located within the
range of %I or %AI memory configured for transfer to the host, and cannot correspond
to an input module. It must correspond to a gap in the input portion of the remote
drop I/O map.
a44888
PCM, GDS
OR
ADS
REMOTE I/O
SCANNER
% I
MEMORIES
WRITE
MEMORIES
% I
% AI
INPUT
MODULES
HOST
CPU
% AI
The transport delays between the CPU and the Remote I/O Scanner should be
considered when analyzing system timing.