7 Data Link Processing Time
7.1 Link Scan Time
73
FX3U-16CCL-M User's Manual
1
Introduction
2
Specification
3
System
Configuration
4
Installation
5
Wiring
6
Introduction of
Functions
7
Data Link
Processing
Time
8
Parameter
Setting
9
Data Link
Procedure
10
Buffer Memory
• RT: Retry processing time (only applies to the link scan with a faulty slave station in which data link is being
performed)
α + β × (Number of the detected faulty stations - 1)
-
α: Retry processing time of the first station
BT × {(200 + R) × Retry count setting value + 178.5}
- When a transient request is made
R: 13.2 + (NI
× 4.8) + (NW × 9.6) + 180
- When a transient request is not made
R: 13.2 + (NI
× 4.8) + (NW × 9.6)
- β: Retry processing time of the second and subsequent stations
BT × {(200 + P) × Retry count setting value + 178.5}
P: 10.8
• F: Return processing time (only when there is a faulty station)
BT × {243.1 + 210.8 × (number of automatic return modules - 1)} + ST
2. Calculation example
Using the following system configuration when the transmission speed is 10 Mbps (assuming that there is no
faulty station, transient transmission or retry)
Example of system configuration
Calculation expression
LS = BT {27 + (NI × 4.8) + (NW × 9.6) + (N × 30) + (Ni × 4.8) + (nw × 9.6) + TR} + ST + EX + RT + F [μs]
•BT = 0.8
• ST = 1600
1) 800 + (7 × 15) = 905
2) 900 + (6 × 50) = 1200
3) 1200 + (4 × 100) = 1600
• EX = 250
{50 + 80 (occupies 2 stations, double) × 2 + 90 (occupies 1 stations, quadruple) × 1 = 250}
• NI = 7 -> 8
•NW = 6 -> 8
• N = 5 (Number of connected units)
• Ni = 7 (Total number of stations occupied)
• nw = 5 (Number of stations occupied other than the remote I/O station)
• TR = 0 (No transient transmission)
• RT = 0 (No retry)
• F = 0 (No faulty station)
LS = BT {27 + (NI × 4.8) + (NW × 9.6) + (N × 30) + (Ni × 4.8) + (nw × 9.6) + TR} + ST + EX + RT + F
= 0.8 {27 + (8 × 4.8) + (8 × 9.6) + (5 × 30) + (7 × 4.8) + (5 × 9.6) + 0} + 1600 + 250 + 0 + 0
= 2149.0 [μs]
= 2.149 [ms]
Master
station
Remote I/O
station
(Occupies 1
station)
Remote device
station
(Occupies 2
station, double)
Intelligent device
station
(Occupies 1
station, quadruple)
Remote device
station
(Occupies 2
station, double)
Remote I/O
station
(Occupies 1
station)
Station No. 1 Station No. 2 Station No. 4 Station No. 5 Station No. 7
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