Mitsubishi Electric Melsec Q Series User Manual page 241

APPENDIX
Programmable
controller CPU
[ READ ]
(Processing ended)
App - 3
(3) Number of resends
Set the number of resends in case that timeout occurs due to packet loss caused
by poor line condition.
REMARKS
The following shows the resend processing flow of the Ethernet modules.
Ethernet module
(communication request
source station)
Resend
Resend
(4) Total processing time of the data link instruction (when the
instruction is resent)
The following shows the formula.
Total processing time of the data link instruction (when the instruction is resent by
the number of resends) = St × 2 + Arrival monitoring time × Number of resends + Rt
St: Sequence scan time of the CPU module on the communication request
source station
Rt: Response time of the CPU module on the communication request destination
station
Ethernet module
(communication request
destination station)
Command (UDP)
Receive response (UDP)
(No response)
Command (UDP)
Receive response (UDP)
(No response)
Resent by the
number of resends
Command (UDP)
Receive response (UDP)
Response (UDP)
Receive response (UDP)
MELSEC-Q/L
Programmable
controller CPU
Read request
Read data
App - 3