Mitsubishi Electric Melsec Q Series User Manual page 172

6 DEDICATED INSTRUCTIONS
Receive data
Device
(D1) + 1
to Receive data
(D1) + n
Setting option
Do not inquire
(Do not read)
Inquire (Read)
Functions
CPU module
MRECV "Un" (S) (D1) (D2)
6 - 5
Item
This stores the contents (header + attached file) of the
received e-mail.
POINT
The receive data storage device (D1) requires a contiguous free area equal to or
greater than the receive data length ((S) + 9) (maximum of 6517 words).
2 The "Set by" column indicates the following:
• User: Data is set by the user before executing a dedicated instruction.
• System: The programmable controller CPU stores the execution result of a
dedicated instruction.
3 The following shows a description of the processing after the MRECV instruction is
executed by selecting the execution type.
Description of processing
• Execute only the read processing
of e-mails from the mail server.
• Inquire (read) about information
on receive mails remaining on
the mail server after the time set
in a programming tool
parameter.
• Execute the read processing of
e-mails from the mail server.
• After executing the MRECV
instruction, the inquiry (read)
processing of information on
receive mails remaining on the
mail server is also executed.
(Inquire whether or not mails are
received immediately.)
4 For a list of error codes, see the User's Manual (Basic).
(1) This instruction reads receive mails from the mail server.
Set data
Merit
No extra read
processing is executed
when there are no mails
on the mail server.
Receive mails stored on
the mail server can be
read in succession.
Ethernet module
Buffer memory
Header

Attached file
MELSEC-Q/L
Setting range
—
Demerit
Even if mails remain on the mail
server, they cannot be read
immediately.
Mails tend to accumulate on the
mail server.
Inquiries to the mail server are
more frequent.
More processing in the module
affects other internal processing.
Mail server
Destination mail address
Header (Subject, etc)
Main text
Attached file
2
Set by ( )
System
6 - 5