AH500 Hardware and Operation Manual 
11-90 
11.4.7.3   Program Change Log Page 
This page displays information on any changes on the program, including changed item, date and time when 
the change occurred. You can use the Clear log button to clear the program change record.       
 
 
Refresh cycle 
Refresh cycle time; default: 10; unit: second 
“-“ 
Minus; click once to decrease 1; the minimum value is 1 
“+“ 
Plus; click once to increase 1; the maximum value is 60 
“Clear log” 
Use this button to clear the program log in the PLC CPU 
Item 
The item that is changed in the program; read only 
Date & Time 
The date and time when the change occurred; read only