Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 307

(2) Minimum processing time of communications using a random access buffer
Trs = Kr + (Kdr  Df) + ACK processing time of a connected device (added only for TCP/IP communications)
Trs
Kr, Kdr
Df
ACK processing time of the
connected device
Communications using a binary code
Reading
Communications using an ASCII code
Communications using a binary code
Writing
Communications using an ASCII code
[Calculation example 1]
The time between the E71 receiving request data from a personal computer and it completing reading when the
E71 communicates with the personal computer in TCP/IP and reads 508-word data of a binary code from a
random access buffer (unit: ms)
• 2.508 + ACK processing time of the connected device (ms)  2.0 + (0.0010  508) + ACK processing time
of the connected device
[Calculation example 2]
The time between the E71 receiving request data from a personal computer and it completing writing when the
E71 communicates with the personal computer in TCP/IP and writes 508-word data of a binary code to a random
access buffer (unit: ms)
• 2.8128 + ACK processing time of the connected device (ms)  2.0 + (0.0016  508) + ACK processing time
of the connected device
The time between the E71 receiving request data from a personal computer
and it completing the process (unit: ms)
Constant (Refer to the table below.)
Number of request data words
The time between a random access buffer reading/writing completed and the
connected device returning ACK
Item
LJ71E71-100
TCP/IP communications
Kr Kdr
2.0 0.0010
2.0 0.0032
2.0 0.0016
2.0 0.0056
APPENDICES
UDP/IP communications
Kr Kdr
1.4 0.0012
1.4 0.0033
1.4 0.0018
1.4 0.0048
305
A