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5 DATA LINK PROCESSING TIME
MELSEC-QnA
(2) Local station
master station
Indicates the time from when a local station issues an instruction until it receives
a reply from the master station.
[Expression]
(a) For reading
MB = [SL + LS × 3 + α + SM + LS + {(No. of reading points +16)/72}
1
× LS + β + constant bps] × N [ms]
SM : Master station sequence scan time
SL : Local station sequence scan time
LS : Link scan time (Refer to section 5.2)
α : Send end internal processing time
LS
β : Receive end internal processing time
LS
[Constant bps]
Transmission speed 156kbps 625kbps 2.5Mbps 5Mbps 10Mbps
constant bps LS LS × 2 LS × 4 LS × 6 LS × 7
N : No. of execution instructions simultaneously
1 : Raise the decimals to a unit
(Example) When master station sequence scan time is 10ms, local station sequence
scan time is 10ms, link scan time is 5ms, no. of reading points is 20 words,
transmission speed is 10Mbps, no. of execution instructions simultaneously
is 1
MB = [SL + LS × 3 + α + SM + LS + {(No. of reading points +16)/72}
1
× LS + β + constant bps] × N
= [10 + 5 × 3 + 5 + 10 + 5 + {(20 + 16)/72} × 5 + 5 + 5 × 7] × 1
= [10 + 5 × 3 + 5 + 10 + 5 + 1 × 5 + 5 + 5 × 7] × 1
= 90 [ms]