Mitsubishi MELSEC-Q Series User Manual page 117

5 DATA LINK PROCESSING TIME
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(4) Master station (RWw)
This indicates the time from the moment data is set to the CPU device until the
data for the remote device station is changed.
[Expression]
[Normal value]
(a) Asynchronous mode
SM + LS 1 + Remote device station processing time [ms]
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms and the remote device station processing time is 1.5 ms.
SM + LS
= 20 + 3
= 24.5 [ms]
(b) Synchronous mode
SM n + LS + Remote device station processing time [ms]
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
n: (LS/SM)value when fractions following the decimal point are
rounded up to the next whole number
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms and the remote device station processing time is 1.5 ms.
SM
= 20
= 24.5 [ms]
[Maximum value]
(a) Asynchronous mode
SM + LS 2 + Remote device station processing time [ms]
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms and the remote device station processing time is 1.5 ms.
SM + LS
= 20 + 3
= 27.5 [ms]
(b) Synchronous mode
SM n + LS + Remote device station processing time [ms]
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
n: (LS/SM)value when fractions following the decimal point are
rounded up to the next whole number
(Example) When the sequence scan time for the master station is 20 ms, the link scan
time is 3 ms and the remote device station processing time is 1.5 ms.
SM
= 20
= 24.5 [ms]
remote device station (RWw)
1 + Remote device station processing time [ms]
1 + 1.5
n + LS + Remote device station processing time [ms]
1 + 3 + 1.5
2 + Remote device station processing time [ms]
2 + 1.5
n + LS + Remote device station processing time [ms]
1 + 3 + 1.5
MELSEC-Q
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