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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.5
Transmission Sequence Timing Charts and Communications Time
(1) TO read data from the PC CPU to the computer
("*"
indicates that the message wait time has been set.)
I
Computer
I
I
T
X
his
period is 0 if the message wait time is
not set or message wait time is shorter than
communications time with the PC CPU.
END
Step
0
END
Step
0
END
Step 0
p i G q
For file register and parameter, an extra 1 scan plus T2 is required
(2) To write data from the computer to the PC CPU
("*" indicates that message wait time has been set.)
'Wait CMI)
,
T4
;
I
!
,
Check of PC CPU
Data
\
RUNISTOP, etc
A
with the PC CPU.
T I
I
Tz
'
Ts
I
T3
I
i
Sequence
END
Step
0
END
Step
0
END
Step
0
IREMARK]
As shown above, communications between the AJ71 C24 and the PC CPU is always made after
END. Therefore, the scan time is extended by the time used for communications.
Appendix 5 gives the communications time,
Section 3.3.1 gives the number of paints processed per communication after END
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