Communication Cycle Intervals - Mitsubishi Electric MELSEC iQ-R Series User Manual

Communication cycle intervals

The minimum value of the communication cycle interval (cyclic data transfer processing time) 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".
Communication mode
Unicast mode
Multicast mode
Precautions
■When the calculation value is set and cyclic transmission is not performed
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 while the calculation value is set, set a value obtained by the following formula:
Minimum value for cyclic transmission time + Greatest value among the two values shown below.
• 10% of the calculated minimum cyclic transmission time
• When the communication speed for the master station is set to 1Gbps: The number of slave stations  2s
• When the communication speed for the master station is set to 100Mbps: The number of slave stations  20s
Each calculation value obtained from the calculation formulas mentioned above are stored in the following SW.
• SW0072: Communication cycle intervals (calculation value) [s]
• SW0073: Cyclic transmission time (calculation value) [s]
• SW0078: Transient transmission time (calculation value) [s]
■When the calculation value is larger than the setting
If each calculation result is larger than the set value of "Basic Period Setting" under "Basic Settings" as follows, an error
occurs.
When an error occurs, each calculation value is displayed in "Detailed information" in the [Error Information] tab of module
diagnostics. Correct each set value of "Basic Period Setting" referring to the calculation value displayed so that the set value
is equal to or larger than the calculation value.
• 3010H: When the communication cycle interval (calculation value) [s] is larger than the set value of "Communication
Period Interval Setting"
• 3011H: When the cyclic transmission time (calculation value) [s] is larger than the set value of "Cyclic Transmission Time"
• 3013H: When the transient transmission time (calculation value) [s] is larger than the displayed value of "Transient
Transmission Time"
■When the general CC Link IE TSN module is CC-Link IE TSN Class A
If "CC-Link IE TSN Class" of a general CC Link IE TSN module added to the list of stations in the network configuration setting
is "CC-Link IE TSN Class A" and the values of 'Communication cycle interval (calculation value)' (SW0072) and 'Cyclic
transmission time (calculation value)' (SW0073) are set to "Communication Period Interval Setting" and "Cyclic Transmission
Time", the cyclic transmission may not be performed. In that case, take either of the following actions.
• Select which device to actually use from "Module List" and add it to list of stations.
• Refer the manual of the device used to check the maximum response time for the time managed polling method, and
calculate and set the communication cycle interval and cyclic transmission time.
APPX
526
Appendix 6 CC-Link IE TSN Processing Time
Master station communication speed
1Gbps
100Mbps
1Gbps
100Mbps
Calculation formula reference
Page 528 Unicast mode (1Gbps)
Page 531 Unicast mode (100Mbps)
Page 534 Multicast mode (1Gbps)
Page 538 Multicast mode (100Mbps)