Communication Cycle Intervals; Processing Time For Motion Control Stations; Processing Time For Standard Stations - Mitsubishi Electric MELSEC iQ-F FX5 Series User Manual

Communication cycle intervals

Set the communication cycle interval (cyclic data transfer processing time) using the following calculation formula as a
reference.
Calculation formula
Communication cycle interval = Processing time for Motion control station + Processing time for standard station
Setting example
When performing interpolation control or synchronous control with a configuration where the number of set axes for the
Motion control station is 16 axes (8 real servo amplifier axes and 8 command generation axes) and the number of standard
stations is 16 stations (link device points: 3072 points)
Communication cycle interval = Processing time for Motion control station: 897 μs + Processing time for standard station:
2100 μs = 2997 μs
As such, set the communication interval cycle to 4000 μs or higher.

Processing time for Motion control stations

The calculation formula differs by the number of set axes. The number of set axes is the total number of real servo amplifier
axes and command generation axes.
Number of set axes
1 axis to 8 axes
9 axes to 16 axes
*1 The basis for the measured value is as follows. Real servo amplifier axis: 2-axes circular interpolation, Command generation axis: 1-axis
incremental control.
As such, the calculated processing time may be exceeded depending on the control details. Use only as a reference when setting.

Processing time for standard stations

The minimum value of the processing time for standard stations is calculated by the following calculation formula. The parts
enclosed in double quotation marks (" ") in the table of Variable are the values set for "Network Configuration Settings" under
"Basic Settings".
Precautions
■When cyclic transmission is not performed with a calculation value
The minimum values for communication cycle interval and cyclic transmission time calculated by the formulas serve as a
guide. If cyclic transmission is not performed with a calculation value as a setting value, add the largest value below to the
minimum value of the cyclic transmission time and set the value again.
• 10% of minimum value of the calculated cyclic transmission time
• Communication speed of the master station is 1 Gbps: Number of device stations  2 s
• Communication speed of the master station is 100 Mbps: Number of device stations  20 s
Each calculation value obtained from the calculation formulas mentioned above are stored in the following SW.
• SW0072: Communication cycle interval (calculation value) [s]
• SW0073: Cyclic transmission time (calculation value) [s]
• SW0078: Transient transmission time (Calculation value) [s]
Processing time for Motion control station[μs]
59  number of set axes + 212
25  number of set axes + 497
*1
Appendix 4 Processing Time
A
APPX
201