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MELSEC-F
SPECIFICATIONS3
3 - 4
2) Ethernet module PLC
Data is sent and received in 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.
(3) The amount 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
Communication using fixed buffer
Procedure exist 1017 words (Binary code) 508 words (ASCII code)
No procedure 2046 bytes
Sending/receiving by e-mail
Attached file : Maximum of 2048 words
or
Main text : Maximum of 256 bytes
PLC
Binary code
Ethernet module
Commu-
nication
data
storage
area
BIN/ASCII
conversion
ASCII code
External
device
Binary code
ASCII code data
31
H
,35
H
"1","5"
(Two bytes)
31
H
,32
H
,33
H
,34
H
"1","2","3","4"
(Four bytes)
Binary code data
15
H
(One byte)
1234
H
(Two bytes)
(Example)