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MELSEC-Q
3 SPECIFICATIONS
(2) Multiplexed remote master station multiplexed remote sub-
master station
(a) Cyclic transmission (LB/LW/LX/LY periodic communication)
The transmission delay time of B/W/Y communication is the sum of the
following:
• Scan times of multiplexed remote master station and multiplexed remote
sub-master station (Except for the link refreshing time)
• Link refresh times of multiplexed remote master station and multiplexed
remote sub-master station
• Link scan time of multiplexed remote master station
Calculate the sum as shown below:
[Transmission delay time of B/W/Y communication]
1) Multiplexed remote master station Multiplexed remote sub-master station:
Transmission delay time (T
DM1
)
[Multiplexed remote master station side scan time (Sm) > Link scan time (LS)]
T
DM1
= (Sm + α m) + LS + (Ss 2 + α s) [ms]
[Multiplexed remote master station side scan time (Sm) < Link scan time (LS)]
T
DM1
= (Sm + α m) round up [LS/(Sm + α m)] + LS + (Ss 2 + α s) [ms]
2) Multiplexed remote sub-master station
Multiplexed remote master station:
Transmission delay time (T
DS1
)
[Multiplexed remote master station side scan time (Sm) > Link scan time (LS)]
T
DS1
= (Ss + α s) + (Sm + α m) 2 + Sm [ms]
[Multiplexed remote master station side scan time (Sm) < Link scan time (LS)]
T
DS1
= (Ss + α s) + (Sm + α m) round up [LS/(Sm + α m)] 2 + Sm [ms]
Sm :Multiplexed remote master station side scan time
Ss :Multiplexed remote sub-master station side scan time
αm :Multiplexed remote master station side link refresh time
αs :Multiplexed remote sub-master station side link refresh time
LS :Link scan time
round up :Round up decimal fraction of the operation result
[LS/(Sm + α m)]
The above calculations are effective under the following conditions:
• There are no faulty stations.
• Transient transmission is not executed.
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