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11. PLC Help Function
11.1 Alarm Message Display
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11.1 Alarm Message Display
The contents of an alarm that occurred during sequence (user PLC) processing can be displayed on the setting
and display unit.
Up to four alarm messages can be displayed at a time on the alarm diagnosis screen. The maximum length of a
message is 32 characters.
11.1.1 Interface
The alarm message display interface is available in the two types: F type in which temporary memory
F is used for message display request and R type in which file register (R) is used for message
display request. Either type is selected by using a parameter.
(1) F type interface
This interface applies to 128 points of temporary memory F0~F127.
If temporary memory F is used as the alarm interface, do not use it for another purpose.
F0
F1
F2
F3
F4
F5
1
0
1
1
0
1
1
0th message of message table is displayed (dn1).
Second message of message table is displayed (dn
2).
Third message of message table is displayed (dn
3).
Fifth message of message table is displayed (dn
4).
F127
The highest priority is assigned to the F0 signal. The message corresponding to Fn set to 1 is
fetched from the message table and displayed in order starting at F0. If no messages are
prepared or Fm greater than the number of prepared messages is set to 1, the message "USER
PC ERROR m" is displayed.
(2) R type interface
This interface applies to file registers R118~R121. The numeric value (binary) contained in each
of the R registers indicates the position of the message to be displayed in the message table.
The message is cleared by setting the R register to 0.
R118
R119
R120
R121
1
0
20
5
First message of message table is displayed (dn1).
20th message of message table is displayed (dn
2).
Fifth message of message table is displayed (dn
3).
Message processing module
The messages are displayed starting at the message corresponding to R118 from top to bottom.
Since message display is cleared by setting the R register to 0, number 0 in the table message
cannot be used in the R mode.
If greater value than the number of prepared messages, m is set in the R register, the message
"USER PC ERROR m
" is displayed.