Appendix 7 Processing Time Of Ethernet/Ip; Transmission Delay Time - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 7

Transmission delay time

The following describes the formulas used to calculate the transmission delay time of EtherNet/IP communications.
Note that the processing time may be prolonged depending on the load ratio of the network (degree of line congestion), the
processing performance of controllers, and the system configuration.
Class1 communication transmission delay time
The following describes the concept and the calculation formula of the transmission delay time of Class1 communications. (It
does not include the refresh processing time.)
■Concept of transmission delay time
CPU module
RJ71GN11-EIP
EtherNet/IP device
No. Item name
(1) Sequence scan
(2) Module processing time
(3) RPI
■Concept of receive delay time
EtherNet/IP device
RJ71GN11-EIP
CPU module
No. Item name
(1) Sequence scan
(2) Module processing time
(3) RPI
■Calculation formula of transmission delay time
Calculation value
Normal value
Maximum value
*1 Calculate the module processing time using the following formula.
Module processing time [ms] = 0.0006  Total data size [byte] + 0.007  number of connections
APPX
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Appendix 7 Processing Time of EtherNet/IP

Processing Time of EtherNet/IP
(1)
(2)
Description
Time required from setting the transmitted data in a program to refreshing the buffer memory on the CC-Link
IE TSN Plus module
Time required for transferring transmitted data from the buffer memory on the CC-Link IE TSN Plus module
to the send buffer
RPI setting value (transmission interval time)
(3)
Description
Time required for refreshing the receive data from the buffer memory on the CC-Link IE TSN Plus module to a
program
Time required for transferring receive data from the receive buffer to the buffer memory on the CC-Link IE TSN
Plus module
RPI setting value (transmission interval time)
Calculation formula (Unit: ms)
0.573 + (sequence scan  2) + module processing time
0.725 + sequence scan time + module processing time
(3)
(2)
(1)
*1
+ RPI
*1
+ (RPI  1.5)