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Mail Receive Function Status Section 3-5
3-5 Mail Receive Function Status
3-5-1 Accessing Memory/Receiving Mail Flag
The Accessing Memory/Receiving Mail Flag is located in CIO Area words
allocated to the Ethernet Unit as a CPU Bus Unit.
The leading address (n) of the allocated CIO area is determined by the Ether-
net Unit's unit number (n = CIO 1500 + 25 × unit number).
Accessing Memory/
Receiving Mail Flag (Bit 02
of n+17)
When the mail receive function receives a FileWrite, FileRead, FileDelete,
FileList, IOMWrite, or IOMRead command, the Ethernet Unit will access the
CPU Unit's I/O memory and automatically create a data file. The Accessing
Memory/Receiving Mail Flag (bit 02 of n+17) will be ON while the CPU Unit's
memory is being accessed.
To maintain the uniformity of the data in the data file, use this flag as a condi-
tion for write operations in the ladder program to prevent the ladder program
from overwriting the data while it is being converted to a data file.
3-6 I/O Memory Data Formats
IOM Format When 5 words of hexadecimal I/O memory data (1234, 5678, 9ABC, etc.) are
being copied to an attached file in IOM format, the data is stored in the
attached file as shown in the following diagram.
Example: Binary data format with a return every 10 fields
Note The IOM file format is compatible with the CPU Unit's READ DATA FILE and
WRITE DATA FILE instructions (FREAD and FWRIT) set to binary data for-
mat.
F304 Protected (File extension) Attached file type (filename exten-
sion) is disabled in the protection set-
tings.
F305 File size exceeds than the
maximum size.
Attached file is too large.
F4FF Other Error Other error
Response
Code
Response Status Description
Accessing Memory/Receiving Mail Flag
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
- - - - - - - - - - - - - -
n+17
-
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9
+0 1234 5678 9ABC DEF0 1234 5678 9ABC DEF0 1234 5678
+10 9ABC DEF0 1234 5678 9ABC DEF0 1234 5678 9ABC DEF0
XX XX XX 12 34 56 78 9A BC DE F0 12 34
48 bytes (Reserved for system)
IOM file contents
I/O memory contents