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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no longer active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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Summary of Contents for Freelance 2000
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