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App - 2
APPENDIX
App - 2
App
MELSEC-F
(2) Minimum processing time of communication using MC protocol
(batch read and batch write)
Tfs = Ke + (Kdt Df) + Scr number of scans required for processing +
ACK processing time of external device
*1 The timing sequence from when the Ethernet module receives the
request data from the personal computer until it completes processing is
shown below.
Tfs : Time from when Ethernet module receives request data
from personal computer until it completes processing (unit:
ms)
*1
Ke, Kdt : Constant (refer to the table below)
Df : Number of request data words + number of response data
words (Application data part)
Scr : Scan time
Communication using TCP/IP Communication using UDP/IP
Ke Kdt Ke Kdt
Batch
read
Data communication using binary code 14 0.009 13 0.008
Data communication using ASCII code 18 0.015 13 0.017
Batch
write
Data communication using binary code 14 0.009 13 0.008
Data communication using ASCII code 16 0.027 14 0.027
External device
(personal computer)
Ethernet module
PLC scan time
Command
message
Tfs
ACK
(TCP only)
Step 0
END
Step 0
END
Response
message
ACK
(TCP only)