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 cyclic transmission is not performed with a calculation value used as a setting 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 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 minimum value of the calculated 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 calculated value is greater 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
When the "CC-Link IE TSN Class Setting" of the general CC-Link IE TSN module added to the list of network configuration
setting stations is CC-Link IE TSN Class A, when the calculated values for the communication cycle interval (calculated value)
(SW0072) and the cyclic transmission time (calculated value) (SW0073) are set to "Communication Period Interval Setting"
and "Cyclic Transmission Time", cyclic transmission may not be possible. In this case, perform one of the following
operations.
• Select the actual equipment to be used from the "Module List" and add it to the list of stations".
• Confirm the maximum response time during time-managed polling in the manual of the device used, and calculate and set
the communication cycle interval and cyclic transmission time.
Master station communication speed
1Gbps
100Mbps
1Gbps
100Mbps
Calculation formula reference
Page 295 Unicast mode (1Gbps)
Page 299 Unicast mode (100Mbps)
Page 303 Multicast mode (1Gbps)
Page 307 Multicast mode (100Mbps)
Appendix 7 Processing Time
A
APPX
293