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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.2.2
PC CPU
operation during data communications
(1) PC CPU scan time
In response to the access request from the AJ71C24, the PC CPU
processes only a single request in each END processing while the PC
CPU is running.
Therefore, the scan time is extended by the time used for processing.
For intervening and processing times required for communications
between the AJ71C24 and PC CPU, see Appendix
5.
Scan time is extended approximately
0.2
msec when the AJ71C24 is
loaded, even if the PC CPU is not linked.
(2)
Simultaneous access
Because the PC CPU executes only a single processing in END
processing, if the PC CPU is accessed by more than one AJ71C24,
access to the PC CPU is suspended until other processing is com-
pleted. Thus, the number of times scanning is done is increased.
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