Elster gas-lab Q1, Technical Documentation Manual, Page: 73 / 158

Functional description 5
gas-lab Q1 Page 65
The centralized message of a group characterised Acceptance required links
the states of the single messages contained in that group with an
acceptance signal. The acceptance can either be implemented via an
assigned digital input or via a corresponding menu item, i.e. via the operator
panel. An acceptance accepts all groups at once, no matter via which source
it has been generated.
The centralized message of a group marked Acceptance required is pending
if at least one single message of the group is pending. However, it will only
end with the ending of the last single message if all pending messages have
been accepted. A currently pending single message is also considered
accepted if it had been accepted before it ended.
The fact that a centralized message is still pending after the last single
message has ended indicates that at least one of the single messages has
begun again after the last message has been accepted. In such a case the
single message is or the single messages are to be accepted.
The following illustration shows how the centralized message of a group
marked No acceptance required differs from the one of a group marked
Acceptance required .
Single message M1
Single message M2
Centralized message
group marked
no acceptance required
(= group message)
Centralized message
group marked
acceptance required
Group
Acceptance Acceptance Acceptance
Acceptance
These groups with their centralized and group messages are intended to
provide an overview of the plant conditions.