Section B Messages and Hints
B-11
B 2.2 Acknowledgment of messages
B 2.2.1 Types of acknowledgment
Two types of message acknowledgment are possible, visual acknowledgment and normal
acknowledgment.
Visual acknowledg-
ment This is available in the message line and the hint list. When used in the
message line, an entry is deleted without this having any effect on the
current status of the message in the process station or message list.
An indication is given in the hint list that the hint has been acknowledged
or it is deleted.
Acknowledgment This is available in the message list and, if configured appropriately, in the
message line also. The message is acknowledged in the process station
and also the message list. This changes the status of the message.
Visual acknowledgment does not replace normal acknowledgment; it is an additional
function.
B 2.2.2 Message acknowledgment strategy
The acknowledgment strategy comprises three different acknowledgment levels (levels 1-3).
Acknowledgment level 1 is the highest acknowledgment level. Messages which are configured
with this acknowledgment level must be acknowledged when incoming and outgoing.
Messages on acknowledgment level 2 must only be acknowledged when incoming.
Messages on acknowledgment level 3 do not have to be acknowledged.
A message is designated incoming when the situation giving rise to it has just occurred. It is thus
entered for the first time in the message line and message list.
Example: A message generated when a process value exceeds its limit will be con-
sidered as incoming until the value returns to the "normal zone."
A message is designated outgoing when the situation that caused it is no longer active.In
some cases, acknowledgment must be used to remove these messages from the message line
and the message list.
Example: A message generated when a process value exceeds its limit will be con-
sidered as outgoing when the associated value is again in the "normal
zone".
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