App - 2 App - 2
MELSEC-F
APPENDIX
App
(2) Minimum processing time of communication using MC protocol
(batch read and batch write)
Tfs = Ke + (Kdt
×
Df) + Scr
×
number of scans required for proc
ACK processing time of external device
Tfs
: Time from when Ethernet block 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
1 The timing sequence from when the Ethernet block receives the
request data from the personal computer until it completes processing
is shown below.
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)
Communication using TCP/IP
Communication using UDP/IP
Ke Kdt Ke Kdt
Data communication using binary code
14
0.009
13
0.008
Batch
read
Data communication using ASCII code
18
0.015
13
0.017
Data communication using binary code
14
0.009
13
0.008
Batch
write
Data communication using ASCII code
16
0.027
14
0.027
Содержание FX3U-ENET
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Страница 159: ...8 6 8 6 MELSEC F 8 COMMUNICATION USING MC PROTOCOL MEMO ...
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