APPX
Appendix 3 Buffer Memory
91
A
Latest address of alarm history
This area shows the buffer memory address where the latest alarm history is stored.
■
Buffer memory address
The following table shows the buffer memory address of this area.
Alarm history No.
Up to 16 alarms that have occurred in the module are registered.
Ex.
For Alarm history No.1
*1 The value stored when the number of input ON times alarm detection count reached (alarm code: 800H) occurs at 12:34:56.789 on
Friday, May 27, 2016
■
Buffer memory address
The following table shows the buffer memory address of this area.
Buffer memory name
X/Y0 to X/YF
Latest address of alarm history
256
Item
Description
Example
Alarm code
The alarm code is stored.
800H
First/Last two digits of the year
The error time is stored in the BCD code.
2016H
Month/Day
527H
Hour/Minute
1234H
Second
56H
Day of the week
The following values are stored in the BCD code for each day of the week.
Sunday: 0, Monday: 1, Tuesday: 2, Wednesday: 3
Thursday: 4, Friday: 5, Saturday: 6
5H
Millisecond (upper)
The error time is stored in the BCD code.
7H
Millisecond (lower)
89H
System area
Buffer memory name
Alarm history No.1 to Alarm history No.16
Alarm history No.
272 to 399
b15
b8 b7
b0
…
Alarm code
First two digits of the year
Last two digits of the year
Month
Day
Hour
Minute
Second
Day of the week
Millisecond (higher-order digits)
Millisecond (lower-order digits)
Un\G272
Un\G276
Un\G275
Un\G274
Un\G273
Un\G277
Un\G278
Un\G279
to
to
System area
Содержание MELSEC iQ-RX40NC6B
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