Mitsubishi MELSEC Q Series User Manual page 157

5 DATA LINK PROCESSING TIME
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(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
= 66.15
= 66.2 [ms]
(2) Local station
This indicates the time from the moment an instruction is issued by the local
station until a response from the master station is received.
[Expression]
[Maximum value]
(a) RIRD instruction
OT + LS [BC + {(read points + 16)/72}
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
SM: Master 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
= 66.15
= 66.2 [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
SM: Master station sequence program scan time
(0 when writing buffer memory in the CC-Link)
1: Round up below the decimal point
[BC + {(write points + 16)/72}
[12 + {(20 + 16)/72}
[12 + {1 1.13}]
master station
156 kbps 625 kbps 2.5 Mbps 5 Mbps
BC 6
[BC + {(read points + 16)/72}
[12 + {(20 + 16)/72}
[12 + {1 1.13}]
156 kbps 625 kbps 2.5 Mbps 5 Mbps
BC 6
MELSEC-Q
1
1.13] [ms]
1
1.13]
1
1.13] + SM [ms]
7 9 11
1
1.13] [ms]
1
1.13]
1
1.067] + SM [ms]
7 9 11
10 Mbps
12
10 Mbps
12
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