# Link Scan Time - Mitsubishi Electric RD77GF8 User Manual

Melsec iq-r series, simple motion module.

The following is the formula to calculate the link scan time. (When "Link Scan Mode" under "Supplementary Cyclic Settings" in
"Application Settings" is "Sequence Scan Asynchronous")
LS = {Np + (Ns  Ka) + (Nt  Kb) + Kc + Kd}  1000 + p [ms]
Item
Np
Ns
Nt
Ka
Kb
Kc
Kd
p
• The calculated result by this formula is rough standard values. For the actual link scan time, check the
parameters and the control details that are used.
• When the operation cycle over or the synchronization cycle over occurs, review the processing details or
reduce the number of stations that are used.
Communication mode
Normal
{(Total number of points of "RX/RY Setting" set in "Network Configuration Settings" of "Basic Settings")  4 + (Total
number of points of "RWw/RWr Setting" set in "Network Configuration Settings" of "Basic Settings")  4}  (High-speed:
0.0073, Normal: 0.039)
Number of actually connected stations which are motion mode
Number of actually connected stations which are other than motion mode
45
24
420
The sum of the processing time factor (following values)
of all safety stations in the network. 0 when the safety
communication function is not used
50.1  (Sa - 1) + 9.5  (Sb - 1) + Sc
Sa: Number of safety communication settings with local
stations
Sb: Number of safety communication settings with remote
device stations and motion mode stations
Sc: When including local station: 0, When including
remote device station: 30, When including motion
mode station: 120
Positioning operation time
High-speed
26
13
300
The sum of the processing time factor (following values)
of all safety stations in the network. 0 when the safety
communication function is not used
5  (Sa - 1) + 0.1  (Sb - 1) + Sc
Sa: Number of safety communication settings with local
stations
Sb: Number of safety communication settings with remote
device stations and motion mode stations
Sc: When including local station: 10, When including
remote device station: 10, When including motion
mode station: 80
Appendix 6 Processing Time
A
APPX
169