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App - 3
MELSEC-F
APPENDIX
App - 3
[Calculation example 1]
Calculate the required time (unit: ms) to complete the processing of a
data request from a PC after receiving it, when the Ethernet module and
the PC perform TCP/IP communication and read 32 points of ASCII
code data from the data register (D) in the PLC using MC protocol
communication.
• Assume that the scan time of the FX
3U
-ENET installed station is 40 ms:
59.17 + ACK processing time of the external device (ms)
18 + (0.015 (12 + 66)) + 40 1 + ACK processing time of the
external device
Command data length = 12 words
Response data length = 66 words
[Calculation example 2]
Calculate the required time (unit: ms) to complete the processing of a
data request from a PC after receiving it, when the Ethernet module and
the PC performs TCP/IP communication and writes 32 points of ASCII
code data to the data register (D) in the PLC using MC protocol
communication.
• Assume that the scan time of the FX
3U
-ENET installed station is 40 ms:
58.11 (ms) 16 + (0.027 (76 + 2)) + 40 1
Command data length = 76 words
Response data length = 2 words