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MELSEC-Q
3 SPECIFICATIONS
(1) Remote master station remote I/O station
(a) Cyclic transmission (X/Y/W periodic communication)
Transmission delay time of X/Y/W is the sum of the following.
• Remote master station scan time (Except for the link refreshing time)
• Remote master station link refresh time
• Link scan time
• Remote I/O station I/O refresh (X/Y) or automatic refresh (W)
Calculate the sum as shown below:
(Note that for X/Y communication time, it is necessary to add the I/O
module response delay time to the calculation)
1) In the case of END synchronization
[X transmission delay time (T
DX)] (END synchronization)
[Remote master station scan time (Sm) > link scan time (LS)]
T
DX = (Sm + m) 2 + Sm + TRIOR [ms]
0: 0 step
E: END step
0E
Sm
m
LS
Remote master station
Link scan time
Remote I/O station
T
DX
ON
X
The remote master station
confirms the X attached
near the end step
T
RION
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
LS LS LS LS
[Remote master station scan time (Sm) < link scan time (LS)]
T
DX = (Sm + m) round up [LS/(Sm + m)] 2 + Sm + TRIOR [ms]
LS
T
DX
ON
X
LS LS
T
RION
Remote master station
Link scan time
Remote I/O station
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
0: 0 step
E: END step
The remote master station
confirms the X attached
near the end step
Sm
m
LS
T
RIOR
round up
: Remote master station scan time
: Remote master station link refresh time
: Link scan time
: I/O refresh time
: Round up the decimal point of the result operation [LS/(Sm + m)]
POINT
The same formula is used to calculate the transmission delay time (TDX)
independently of the Block send/receive data assurance per station setting.