Local Station Local Station - Mitsubishi MELSEC Q Series User Manual

5 DATA LINK PROCESSING TIME
5.3.2 Local station
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local station
(1) Local station
This indicates the time from the moment an instruction is executed by one local
station until a response from another local station is received.
[Expression]
[Maximum value]
(a) RIRD instruction
OT + LS [BC + {(read points + 16)/16}
OT: QCPU (Q mode) dedicated instruction processing time
QnCPU : 1 [ms]
QnHCPU : 0.5 [ms]
LS: Link scan time (see Section 5.1)
BC: Constant
Transmission rate
SL: Target station sequence program scan time
(0 when reading buffer memory in the CC-Link)
1: Round up below the decimal point
(Example) When the PLC CPU type is Q06HCPU, the transmission rate is
10 Mbps, the link scan time is 5 ms and the read points are 20 words
(buffer memory in the CC-Link).
OT + LS
= 0.5 + 5
= 0.5 + 5
= 76.505
= 76.5 [ms]
(b) RIWT instruction
OT + LS [BC + {(write points + 16)/16}
OT: QCPU (Q mode) dedicated instruction processing time
QnCPU : 1 [ms]
QnHCPU : 0.5 [ms]
LS: Link scan time (see Section 5.1)
BC: Constant
Transmission rate
SL: Target station sequence program scan time
(0 when writing buffer memory in the CC-Link)
1: Round up below the decimal point
(Example) When the PLC CPU type is Q06HCPU, the transmission rate is
10 Mbps, the link scan time is 5 ms and the write points are 20 words
(buffer memory in the CC-Link).
OT + LS
= 0.5 + 5
= 0.5 + 5
= 76.505
= 76.5 [ms]
local station
156 kbps 625 kbps 2.5 Mbps 5 Mbps
BC 6
[BC + {(read points + 16)/16}
[12 + {(20 + 16)/16}
[12 + {3 1.067}]
156 kbps 625 kbps 2.5 Mbps 5 Mbps
BC 6
[BC + {(write points + 16)/16}
[12 + {(20 + 16)/16}
[12 + {3 1.067}]
MELSEC-Q
1
1.067] + SL [ms]
7 9 11
1
1.067] [ms]
1
1.067]
1
1.067] + SL [ms]
7 9 11
1
1.067] [ms]
1
1.067]
10 Mbps
12
10 Mbps
12
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