Mitsubishi Electric MELSEC Q Series Reference Manual page 105

3 SPECIFICATIONS
[Instruction transmission delay time (M
Remote master station
Link scan time
Remote I/O station
Remote master station
Link scan time
Remote I/O station
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(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:
)]
D
[Remote master station scan time (Sm) > link scan time (LS)]
= (Sm + m)
M 3 [ms]
D
Instruction
Sm Sm
m
0 E 0 E
LS LS
[Remote master station scan time (Sm) < link scan time (LS)]
= (Sm + m) round up [LS/(Sm + m)]
M
D
Instruction
Sm Sm Sm Sm
m m m
0 E 0 E 0 E 0 E
LS LS
Instruction execution
Sm : Remote master station scan time
m
: Remote master station link refresh time
LS : Link scan time
Mr : Instruction access data refresh time
: Round up the decimal point of the result operation [LS/(Sm + m)]
round up
Completion flag ON
Sm Sm
m m
0 E 0 E
LS LS
M
r
Instruction execution
M
D
Completion flag ON
Sm Sm Sm
m m m m
0 E 0 E 0 E
LS
M
r
M
D
MELSEC-Q
Sm Sm
m m
0 E 0 E
LS
0: 0 step
E: END step
3 [ms]
Sm Sm Sm Sm
m m m
0 E 0 E 0 E 0 E
LS LS
0: 0 step
E: END step
m
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