Minimum Processing Time Of Fixed Buffer Communications; Appendix 7 Processing Time - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Appendix 7
Calculate the minimum processing time for each function with the following formula. Note that the processing time may be
even longer due to the network load rate (line congestion), each connected device's window size, number of connections
being used simultaneously, and the system configuration. The value calculated with the following formula is a guide for the
processing time when communicating with only one connection.
Minimum processing time of fixed buffer communications (between the RJ71EN71s
*1 The processing time will be the same even if the RnENCPU (network part) is mixed.
■Procedure exists
Tfs = St + Ke + (Kdf  Df) + Sr
• Tfs: Time from start to end of send (unit: ms)
• St: Sending station scan time
• Ke, Kdf: Constant (refer to following table)
• Df: Number of send data words
• Sr: Receiving station scan time
Item
When communicating with binary code data
When communicating with ASCII code data
■No procedure
Tfs = St + Ke + (Kdf  Df)
• Tfs: Time from start to end of send (unit: ms)
• St: Sending station scan time
• Ke, Kdf: Constant (refer to following table)
• Df: Number of send data bytes
Item
When communicating with binary code data
Minimum processing time of communications using the random access buffer
Trs = Kr + (Kdr  Df) + external device ACK processing time (added only during TCP/IP communications)
• Trs: Time from reception of personal computer request data to complete of process by RJ71EN71 (unit: ms)
• Kr, Kdr: Constant (refer to following table)
• Df: Number of request data words
• External device ACK process time: Time until external device returns ACK upon completion of random access buffer read/
write
Item
During read When communicating with binary code data
When communicating with ASCII code data
During write When communicating with binary code data
When communicating with ASCII code data
APPX
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Appendix 7 Processing Time

Processing Time
RJ71EN71, RnENCPU
During TCP/IP communications
Ke
6
6
RJ71EN71, RnENCPU
During TCP/IP communications
Ke
4
RJ71EN71, RnENCPU
During TCP/IP communications
Kr
2.5
2.5
2.5
2.6
During UDP/IP communications
Kdf Ke
0.0030 3
0.0100 4
During UDP/IP communications
Kdf Ke
0.0010 3
During UDP/IP communications
Kdr Kr
0.0020 1.8
0.0060 1.9
0.0025 1.8
0.0070 1.9
*1
)
Kdf
0.0020
0.0015
Kdf
0.0007
Kdr
0.0025
0.0065
0.0025
0.0060