Mitsubishi MELSEC-F User Manual page 201

10 USING THE E-MAIL FUNCTION
(2) Data conversion method used by the Ethernet module
When sending e-mails
PLC
Subject
(ASCII data)
Main text
(ASCII data)
Attached file
(binary data)
(3) Flow of the e-mail
Ethernet
PLC
module
FROM/TO
instruction
(Mail send)
1)
Mail send
[When receiving by the Ethernet module]
[When receiving by a PC]
10 - 2
The following shows the data conversion method used by the Ethernet module.
Mail
server
Encode
(Base64/7bit)
Encode
(7bit)
(Binary data)
Encode
(ASCII data)
(Base64)
(CSV data)
The following diagram illustrates the flow of e-mail sent by the PLC to the external
device:
Mail server Mail server
2)
1) Send an e-mail to the mail server of the local station's Ethernet module.
2) The mail server of the local station's Ethernet module sends the e-mail to the
receive mail server of the send destination device.
3) The Ethernet module confirms mail receiving to be active or not for the time
set in the parameters, and stores the results in the buffer memory.
4) By executing the mail receiving command issued by the FROM/TO
instruction, the Ethernet module reads e-mails from the e-mail server to the
mail buffer memory.
When receiving e-mails, the Ethernet module reads the number of
remaining receive mails on the mail server and stores this number in the
buffer memory.
5) Mails can be received using applications such as e-mail software.
When receiving e-mails
Mail
server
(Does not decode)
Subject
(ASCII data)
Main text
(ASCII data)
Attached file
(binary data)
Ethernet
module
3)
Checks whether or not any mails
were received
Stores information
receive mail
Mails received
Request to receive mail
Stores receive mail
PC
5)
MELSEC-F
PLC
Cannot be
received
Decode
(Base64/7bit)
PLC
No mail
received
4)
Confirms
information of
receive mail
FROM/TO
instruction
(Reads receive
mail)
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