Mitsubishi Electric MELSEC Q Series Reference Manual page 106

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