1 FUNCTIONS
1.4 Diagnostic Function
51
1
Error history function
This function stores errors and alarms, which have occurred in the I/O module with diagnostic functions, in the buffer memory
as histories.
Up to 16 histories can be stored for both errors and alarms.
Operation
When an error occurs, the error code and error time are stored sequentially from 'Error history No.1' (Un\G16 to Un\G21).
When an alarm occurs, the alarm code and alarm time are stored sequentially from 'Alarm history No.1' (Un\G272 to
Un\G277).
• Assignment of an error history
• Assignment of an alarm history
Ex.
Storage example of an error history
*1 The value stored when the input response time setting error (error code: 1900H) occurs at 12:34:56.789 on Friday, May 27, 2016
The start address of the error history in which the latest error is stored can be checked with 'Latest address of error history'
(Un\G0).
The start address of the alarm history in which the latest alarm is stored can be checked with 'Latest address of alarm history'
(Un\G256).
Item
Description
Example
Error code
The error code is stored.
1900H
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
b15
b8 b7
b0
…
Error 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\G16
Un\G20
Un\G19
Un\G18
Un\G17
Un\G21
Un\G22
Un\G23
to
to
System area
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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