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MELSEC-Q
6 COMMUNICATION TIME
6.2 Transmission Delay Time
The transmission delay time for input and output data is as follows.
(1) Without separation prevention function
A transmission delay time when I/O data is read/written using the automatic
refresh setting (without separation prevention function) or FROM/TO instruction.
(a) Output delay
Transmission delay time
Normal value
Bus cycle time
Max. value
Bus cycle time 2
(b) Input delay
Transmission delay time
Normal value
Scan time 0.5 + Bus cycle time 0.5
Max. value
Scan time + Bus cycle time
(2) With separation prevention function
A transmission delay time when I/O data is read/written using the automatic
refresh setting (with separation prevention function) or dedicated instruction.
(a) Output delay
Conditions
Transmission delay time
Normal value
Scan time 1.5 + Bus cycle time 0.5
Scan time 2
Bus cycle time
Bus cycle time 2
Max. value
Scan time 2 > Bus cycle time
Scan time 2 + Bus cycle time
(b) Input delay
Conditions
Transmission delay time
Normal value
Scan time 0.5 + Bus cycle time 0.5
Scan time 2
Bus cycle time
Scan time + Bus cycle time
Scan time 2 > Bus cycle time and
Scan time 3
Bus cycle time 2
Scan time + Bus cycle time 2
Max. value
Scan time > Bus cycle time
Scan time 3
