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MELSEC-Q
3 SPECIFICATIONS
(d) Cyclic transmission delay
Since Sm = 1 [ms],LS = 11.8 [ms], the Sm < LS formula is used.
1) Input transmission delay time (T
DX)]
T
DX = (Sm + m) round up [LS/(Sm + m)] 2 + Sm + TRIOR
= (1 + 0.41)
[11.8/(1 + 0.41)] 2 + 1 + 0.024
= 24.6 [ms]
2) Output transmission delay time (T
DY)]
T
DY = (Sm + m) round up [LS/(Sm + m)] + LS + TRIOR
= (1 + 0.41)
[11.8/(1 + 0.41)] + 11.8 + 0.024
= 23.6 [ms]
3.3.3 Switching time from the multiplexed remote master station to the multiplexed remote
sub-master station in a multiplexed remote I/O network
In the multiplexed remote I/O network system, the multiplexed remote sub-master
station takes over the control of the remote I/O station from of the multiplexed remote
master station when it develops an error.
While control is switched from the multiplexed remote master station to the multiplexed
remote sub-master station, the remote I/O station holds output (data).
The switching time from the multiplexed remote master station to the multiplexed
remote sub-master station is expressed with the formula below:
Network
Multiplexed remote
sub-master station
Switching time
An error has occurred on the multiplexed remote master station
K1
Cs
Cm
K2
Ds2
[Switching time from the multiplexed remote master station to the multiplexed
remote sub-master station (Ds2)]
Ds2 = K1 + Cs + Cm [ms]
K1: Internal processing time
• When a power failure or CPU module stop error occurs: 620ms
• When a system is switched by the following: execution of a system switching
instruction, a system switching request by GX Developer, or link cable
disconnection on other network modules: 160ms
Cs: Normal station baton passing/cyclic communication initializing time
= Number of normal stations
9 [ms]
Cm: Error station baton passing/cyclic communication initializing time
= Number of error stations
16 [ms]
(only if any error station is found)