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MELSEC-A
3 SPECIFICATIONS
3.8 Transmission delay time
The transmission delay time (time for data to be conveyed) is shown below.
(1) Calculation expressions
Calculation expression (unit: ms)
Details
When the master
station is the A/QnA
Series
When the master
station is the Q Series
Master station (RX/RWr) R2 (RX/RWr) SM + LS
×
3 +
RS
Master station (RY/RWw) R2 (RY/RWw)
SM + LS
×
3 +
RS
SM + LS
×
2 +
RS
Master station (RX) General-purpose input
(RXnC, RXnD)
SM + LS
×
3 + 10
Master station General-purpose output
(RYnC, RYnD)
SM + LS
×
3 + 2
SM : Master station sequence program's scan time
LS : Link scan time (Refer to Master Module User's Manual)
RS : R2 internal processing time *
1
*1 R2 internal processing time
The R2 internal processing time is calculated with the following equation.
R2 internal processing time (R2) = LS
×
K (constant)
Transmission
speed
156kbps 625kbps 2.5Mbps 5Mbps 10Mbps
K (constant) 2 2 4 8 32
(2) Calculation example
An example for calculating the transmission delay time from the master station
(RX/RWr) to R2 (RX/RWr).
When only one R2 is connected with SM: 20ms, and transmission speed:
156kbps
(a) When the master station is the A/QnA Series
LS : 51.2 {29.4 + (8
×
4.8) + (8
×
9.6) + (1 + 32.4) + (1
×
4.8) + (1
×
9.6)} +
1300
=
11100
µ
s (11.1ms)
20 + 11.1
×
3 + 11.1
×
2 = 75.5ms
(b) When the master station is the Q Series
LS : 51.2 {27 + (8
×
4.8) + (8
×
9.6) + (1
×
30) + (1
×
4.8) + (1
×
9.6)} +
1300 + 0 + 0
=
10854
µ
s (10.9ms)
20 + 10.9
×
2 + 10.9
×
2 = 63.6ms