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MELSEC-Q
3 SPECIFICATIONS
The link refresh is executed by the END processing of the CPU module, but
reading from/writing to the network module is directly performed when an
instruction is executed; thus the transmission delay time can be reduced.
1) Direct access to the sending station
a) When close to step 0
The direct access is faster by a maximum of one scan of a
sequence program when compared with the link refresh.
(Link refresh)
Sequence scan
0END
Link scan
0END
B0
(Direct access)
Sequence scan
0END
Link scan
0END
J1\B0
Same status as the END processing was executed
b) When close to END
The link refresh and the direct access occur at almost the same
time.
(Link refresh)
Sequence scan
0END
Link scan
0END
B0
(Direct access)
Sequence scan
0END
Link scan
0END
J1\B0
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