Communication Cycles Coexistence - Mitsubishi Electric MELSEC iQ-R Series User Manual

Communication cycles coexistence

When device stations with different communication cycles are included in the network, multiple communication cycles
according to each device station are used for communications.
The time for each communication cycle is the total time of cyclic transmission, transient transmission, and system reservation
time.
Even if device stations with different communication cycles are connected to a network, a device station with a high-speed
communication cycle is not affected by a device station with a low speed.
(1)
No.0
(1) Basic cycle
(2) Normal speed
(3) Low speed
• PLCopen Motion control FB mode
When the version of Add-on baseSystem is "1.18" or earlier or a motion control station is used, the
communication cycles coexistence is not supported. If a device station is set to normal or low speed cycle,
an error "Network parameter (error code: 2221H)" occurs.
Setting method
The master station communicates with device stations by using three communication cycles that are the basic cycle under
"Basic Period Setting", and "Normal-Speed" and "Low-Speed" under "Multiple Period Setting". (Page 275 Communication
cycle interval)
The communication cycle of each device station can be selected from "Basic Period", "Normal-Speed", or "Low-Speed" in
"Network Configuration Settings" under "Basic Settings".
Precautions
• When "Communication Mode" under "Application Settings" is set to "Multicast", set "Communication Period Setting" for the
local station in "Network Configuration Settings" to "Basic Period".
• If a motion control station is set to normal or low speed cycle, "Network parameter error (error code: 2221H)" occurs.
(2)
(3)
No.1
No.2
No.3
1 FUNCTIONS
45
1.1 Cyclic Transmission
1