Mitsubishi Electric MELSEC iQ-RJ71EIP91 - Appendix 5 Processing Time; Transmission Delay Time

APPX
Appendix 5 Processing Time
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Appendix 5 Processing Time
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.
■Concept of send delay time
■Concept of receive delay time
■Calculation formula of transmission delay time
*1 Calculate the module processing time using the following formula.
Module processing time[ms] = 0.0001 × Total data size[byte] + 0.007 × number of connections
No. Item name Description
(1) Sequence scan Time required from setting the send data in a program to refreshing the buffer memory on the
RJ71EIP91.
(2) Module processing time Time required for transferring send data from the buffer memory on the RJ71EIP91 to the send
buffer.
(3) RPI RPI setting value (transmission interval time)
No. Item name Description
(1) Sequence scan Time required for refreshing the receive data from the buffer memory on the RJ71EIP91 to a
program.
(2) Module processing time Time required for transferring receive data from the receive buffer to the buffer memory on the
RJ71EIP91.
(3) RPI RPI setting value (transmission interval time)
Calculation value Calculation formula (Unit: ms)
Normal value 0.573 + (sequence scan ÷ 2) + module processing time
*1
+ (RPI ÷ 2)
Maximum value 0.725 + sequence scan time + module processing time
*1
+ RPI
RJ71EIP91
(2)
(3)
(1)
CPU module
EtherNet/IP device
RJ71EIP91
(2)
(3)
(1)
CPU module
EtherNet/IP device