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APPENDIX
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App
MELSEC-F
APPENDIX
Appendix 1 Processing Time
Calculate the minimum processing time for each function using the expressions below.
Note that the processing time may become longer depending on the load factor on the
network (how congested the line is), the window size of each connected device, the
number of connections used concurrently, and how the system is configured. Use the
values obtained from the expressions below as a guideline for the processing time
when communication is performed using only one connection.
(1) Minimum processing time of communication using the fixed buffer
(communication between the Ethernet module)
(a) Communication using the fixed buffer (Procedure exist)
Tfs = St + Ke + (Kdf Df) + Sr
(b) Communication using the fixed buffer (No procedure)
Tfs = St + Ke + (Kdf Df)
[Calculation example]
Calculate the time from the start of sending to the completion of sending
(unit: ms) when the FX
3U-ENET communicate using TCP/IP and send
32 words of binary code data using fixed buffer communication
(procedure exist).
• Assume that the scan time on the receiving side is 30 ms and the
scan time on the transmission side is 25 ms:
67 (ms) 30 + 12 + (0.0065 32) + 25
Tfs : Time from the start of sending to the completion of sending
(unit: ms)
St : Sending station scan time
Ke, Kdf : Constant (see the table below)
Df : Word count of send data
Sr : Receiving station scan time
Communication using TCP/IP Communication using UDP/IP
Ke Kdf Ke Kdf
Data communication using binary code 12 0.0065 10 0.0069
Data communication using ASCII code 12 0.030 10 0.029
Tfs : Time from the start of sending to the completion of sending
(unit: ms)
St : Sending station scan time
Ke, Kdf : Constant (see the table below)
Df : Byte count of send data
Communication using TCP/IP Communication using UDP/IP
Ke Kdf Ke Kdf
Data communication using binary code 7 0.0018 4 0.0014