6-1
OP27,
OP37 Equipment Manual
Release 05/99
Messages
Messages
on the OP indicate events and statuses related to control processes. A
message consists of static text, at least. It may also contain tags.
The following types of message are displayed on the OP:
event messages
alarm messages
system messages
Once issued, alarm messages and event messages are stored on the OP in a
message buf
fer which is protected against a power failure. Messages in the
buf
fer can be called into the display and printed out on a connected printer
. The
OP can still be operated when messages are waiting to be displayed.
Alarm and event messages may contain the following information:
Arrived:
Denotes the occurrence of a message.
Departed:
The reason for the message no longer exists.
Acknowledged
(alarm messages only):
The message has been noted by the operator or the PLC, acknowledged and
confirmed.
The OP records the exact time of the message states and indicates them when a
message page or message buf
fer is displayed.
Overview
Message states
6
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