Transmission Delay Time; Master Station Remote I/O Station - Mitsubishi MELSEC-Q Series User Manual

5 DATA LINK PROCESSING TIME

5.2 Transmission Delay Time

5.2.1 Master station
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This section explains the transmission delay time (the time until data is transmitted).
remote I/O station
(1) Master station (RX)
This indicates the time from the moment the signal is input to the remote I/O
station until the CPU device turns ON (OFF).
[Expression]
[Normal value]
(a) Asynchronous mode
SM + LS 1 + Remote I/O station response time [ms]
SM: Master station sequence program scan time
LS : Link scan time (see Section 5.1)
(Example) When the sequence scan time for the master station is 20 ms, the link
scan time is 3 ms and the remote I/O station response time is 1.5 ms.
SM + LS
= 20 + 3
= 24.5 [ms]
(b) Synchronous mode
(SM n)
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
n: (LS/SM) value when fractions following the decimal point are
rounded up to the next whole number.
(Example) When the sequence scan time for the master station is 20 ms, the link
scan time is 3 ms and the remote I/O station response time is 1.5 ms.
(SM
= (20
= 21.5 [ms]
[Maximum value]
(a) Asynchronous mode
SM + LS × 2 + Remote I/O station response time [ms]
SM: Master station sequence program scan time
LS: Link scan time (see Section 5.1)
(Example) When the sequence scan time for the master station is 20 ms, the link
scan time is 3 ms and the remote I/O station response time is 1.5 ms.
SM + LS
= 20 + 3
= 27.5 [ms]
remote I/O station (input)
1 + Remote I/O station response time [ms]
1 + 1.5
1 + Remote I/O station response time [ms]
n) 1 + Remote I/O station response time [ms]
1) 1 + 1.5
2 + Remote I/O station response time [ms]
2 + 1.5
MELSEC-Q
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