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MELSEC-F
3 SPECIFICATIONS
2) Ethernet module PLC
Data is sent and received in binary code.
PLC
Binary code
Ethernet module
Commu-
nication
data
storage
area
BIN/ASCII
conversion
ASCII code
External
device
Binary code
(2) When communicating using ASCII code, 1-byte binary code data is automatically
converted into 2-byte ASCII code data and then transmitted.
31
H
, 35
H
"1", "5"
(Two bytes)
31
H
, 32
H
, 33
H
, 34
H
"1", "2", "3", "4"
(Four bytes)
(Example)
Binary code data
ASCII code data
15
H
(One byte)
1234
H
(Two bytes)
(3) The size of data that can be communicated at one time between the Ethernet
module and an external device is determined by the function used and the
selected data code (binary/ASCII) settings.
The following shows the maximum sizes of communication data that can be sent
and received at a time with each data communication function.
Data communication function
Exchangeable data size
Communication using MC protocol
The maximum number of point that can be designated with
each command/instruction : Maximum of 32 words
Procedure exist
1017 words (Binary code)
508 words (ASCII code)
Communication using fixed buffer
No procedure
2046 bytes
Sending/receiving by e-mail
Attached file : Maximum of 2048 words,
Main text : Maximum of 256 bytes
Содержание FX3U-ENET
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