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11. PLC Help Function
11.2 Operator Message Display
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11.2 Operator Message Display
When a condition to inform the operator of a message occurs, an operator message can be displayed
independently of an alarm message.
A maximum of 60 characters can be displayed for the operator message on the alarm diagnosis
screen. One operator message can be displayed at a time.
11.2.1 Interface
An operator message is displayed by setting the number of the operator message table to be
displayed in file register R122. It is cleared by setting R122 to 0. Thus, number 0 of the operator
message table cannot be displayed.
Display example
R122
As with alarm messages, the contents of the data register specified for the class number display in
operator message preparation are also displayed.
(Note 1) The class number display is updated when the contents of file register R122 change. It is
not updated if only the contents of the specified data register (Dn) change.
To change the class number display only, the contents of R122 must be cleared to 0. If the
contents
of the specified data register are 0, no class numbers are displayed.