7-1
Equipment
Manual OP7, OP17
Release 04/99
Messages
Messages
displayed on the OP indicate events and states in the control pro
-
cess. A message consists of at least static text and can also include tags.
The following types of message are displayed on the OP:
event messages,
alarm messages and
system messages.
Event and alarm messages displayed are stored in the OP in their own mes
-
sage buf
fers. The messages stored in the buf
fers can be shown on the display
and printed out on the printer in the form of a log.
Event and alarm messages can have the following events:
Arrive:
identifies the occurrence or arrival of the message.
Depart:
cause of the message is no longer available.
Acknowledged
(alarm messages only):
Message has been noticed and confirmed by the operator or the PLC.
These message states are detected by the OP with accurate timing and output
when a message page or the message buf
fer is displayed.
Overview
Message states
7
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