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523
APPENDICES
A
Appendix
5
P
roces
sing T
ime
Appendix
5.
2
Link s
can
tim
e
Appendix 5.2
Link scan time
The following is the formula to calculate the link scan time (when the link scan mode is asynchronous).
LS = {Np + (Ns × Ka) + Kb + Kc + Kd}
1000 + Ni × 0.02 + St [ms]
Item
Cyclic transmission mode
Normal mode
High speed mode
Np
α
: Total number of points of "RX/RY Setting" in "Network Configuration Settings"
β
: Total number of points of "RWw/RWr Setting" in "Network Configuration Settings"
Ns
Number of connected slave stations
Ka
25.8
Kb
655
168
Kc
(Maximum transient processing
time)
160 + 60 × Total number of slave stations set in the
parameters
(0 when transient transmission is not performed)
80 (0 when transient transmission is not performed)
Kd
(Maximum data link processing
time when the station is
disconnected from or returned
to the network)
• When the serial number (first five digits) of the master station is "17022" or later: Number of disconnected
stations × 3500
• When the serial number (first five digits) of the master station is "17021" or earlier: 9000 + Total number of
ports used in the switching hub × 3000 (9000 when the switching hub is not used)
Ni
Number of interrupt settings
St
(Processing time between a
master station and a submaster
station when the submaster
function is used)
This value is added only when the submaster function is used. 0 when the submaster function is not used.
α
: Total number of points of "RX/RY Setting" set for the master station (station number 0) in "Network
Configuration Settings"
β
: Total number of points of "RWw/RWr Setting" set for the master station (station number 0) in "Network
Configuration Settings"
0.08
+
4
4
Conditions
Value
When "Turn OFF or 0 Clear
Input Data (RX/RY)" is set in the
network operation settings
18.5
When "Hold Input Data (RX/RY)"
is set in the network operation
settings
9.75
0.08 + 50
+
4
4
1000