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I/O Memory Data Formats Section 2-6
■ Accessing Memory/Sending Mail Flag (Bit 01 of n+17)
When a data file (IOM, TXT, or CSV) is being attached to the e-mail, the
Ethernet Unit will access the CPU Unit's I/O memory and automatically create
the data file when the e-mail is being sent. The Accessing Memory/Sending
Mail Flag (bit 01 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.
2-6 I/O Memory Data Formats
IOM Format When 5 words of hexadecimal I/O memory data (1234, 5678, 9ABC, etc.) are
being sent as an attached file in IOM format, the data is stored in the attached
file as shown in the following diagram.
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.
TXT Format When hexadecimal I/O memory data (1234, 5678, 9ABC, etc.) is being sent
as an attached file in TXT format, the data is stored with the following proce-
dure.
1. The word data is converted to ASCII.
2. The word data is delimited by hard tabs ([HT]: 09).
3. A return and line feed ([CR][LF]: 0D0A) are inserted after every 10 words.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
- - - - - - - - - - - - - - -
n
Mail Send Switch
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
n+17
-
-
---
--
-------
-
Accessing Memory/Sending Mail Flag
+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
I/O memory contents
IOM file contents
48 bytes
(Reserved for system)