Mitsubishi MELSEC Q Series User Manual page 135

5 DATA LINK PROCESSING TIME
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(2) Master station (RY)
This indicates the time from the moment the CPU device turns ON (OFF) until
the remote device station output turns ON (OFF).
[Expression]
[Normal value]
(a) Asynchronous mode
SM + LS (1
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
m: Constant (expanded cyclic setting)
Expanded cyclic setting
m
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms, the expanded cyclic setting is "double", and the remote device
station processing time is 1.5 ms.
SM + LS
= 20 + 3
= 33.5 [ms]
(b) Synchronous mode
SM n + LS
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
n: (LS
rounded up to the next whole number
m: Constant (expanded cyclic setting)
Expanded cyclic setting
m
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms, the expanded cyclic setting is "double", and the remote device
station processing time is 1.5 ms.
SM
= 20
= 30.5 [ms]
remote device station (RY)
m + 1) + Remote device station processing time [ms]
single
1
(1 m + 1) + Remote device station processing time [ms]
(1 3 + 1) + 1.5
m + Remote device station processing time [ms]
m /SM)value when fractions following the decimal point are
single
1
n + LS m + Remote device station processing time [ms]
1 + 3 3 + 1.5
MELSEC-Q
double quadruple
3 7
double quadruple
3 7
octuple
15
octuple
15
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