5
Functional description
Page 64
gas-lab
Q1
Held group message
The held group message only differs from the normal group message by
always keeping to a hold time; for instance, to take the telecontrol response
times into consideration.
A held group message is pending at least as long as the hold time lasts,
even if the normal group message ends during the hold time.
Group
Single message M1
Single message M2
Group message
Held group message
= holding time
Centralized message
A special feature of the centralized message is that it can link the states of
the single messages with an acceptance signal. The property
Acceptance
required
or
No acceptance required
is defined as group characteristic in the
parameterisation.
All centralized messages are entered in the logbook and error listing.
When a group is marked with
No acceptance required
, the result of the
centralized message is always the same as the result of the group message.
In contrast to the group message, however, the no acceptance requiring
centralized message is entered in error listing and logbook.