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MELSEC-Q
3 SPECIFICATIONS
(b) REMFR/REMTO/READ/WRITE instructions
REMFR/REMTO/READ/WRITE instructions transmission delay time is the
sum of the following.
• Remote master station scan time (Except for the link refreshing time)
• Remote master station refresh time
• Link scan time
Calculate the sum as shown below:
[Instruction transmission delay time (M
D)]
[Remote master station scan time (Sm) > link scan time (LS)]
M
D = (Sm + m) 3 [ms]
LS
Remote master station
Link scan time
Remote I/O station
M
D
Instruction
M
r
Completion flag ON
Instruction execution
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
LS LS LS LS
0: 0 step
E: END step
[Remote master station scan time (Sm) < link scan time (LS)]
M
D = (Sm + m) round up [LS/(Sm + m)] 3 [ms]
0E
Sm
m
LS
Remote master station
Link scan time
Remote I/O station
Instruction
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
0E
Sm
m
LSLSLSLS
M
D
Mr
Instruction execution
0: 0 step
E: END step
Completion flag ON
Sm
m
LS
Mr
round up
: Remote master station scan time
: Remote master station link refresh time
: Link scan time
: Instruction access data refresh time
: Round up the decimal point of the result operation [LS/(Sm + m)]