Switching Time From The Multiplexed Remote Master Station To The Multiplexed Remote Sub-Master Station In A Multiplexed Remote I/O Network - Mitsubishi Electric MELSEC Q Series Reference Manual

3 SPECIFICATIONS
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
[Switching time from the multiplexed remote master station to the multiplexed
remote sub-master station (Ds2)]
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(d) Cyclic transmission delay
Since Sm = 1 [ms],LS = 11.8 [ms], the Sm < LS formula is used.
1) Input transmission delay time (T
= (Sm + m)
T
DX
= (1 + 0.41)
= 24.6 [ms]
2) Output transmission delay time (T
= (Sm + m)
T
DY
= (1 + 0.41)
= 23.6 [ms]
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:
An error has occurred on the multiplexed remote master station
K1
Network
Multiplexed remote
sub-master station
Switching time
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
Cm: Error station baton passing/cyclic communication initializing time
= Number of error stations
(only if any error station is found)
DX
round up [LS/(Sm + m)]
[11.8/(1 + 0.41)]
round up [LS/(Sm + m)] + LS + T
[11.8/(1 + 0.41)] + 11.8 + 0.024
Cs
Cm K2
Ds2
9 [ms]
16 [ms]
MELSEC-Q
)]
2 + Sm + T
2 + 1 + 0.024
)]
DY
RIOR
RIOR
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