Functional description
5
gas-lab
Q1
Page 63
If a message is entered in the error listing, beginning and end of this message
are also entered in the logbook. The archive module is able to log the logbook of
the monitoring module.
Individual messages can be
disabled
during operation. This is rather helpful
during a plant inspection, for instance. The message processing completely
disregards a disabled message, which is always considered as being not
pending. The state of a message (disabled / enabled) can be changed via the
operator panel of the device, the parameterisation and a DSfG adjusting
telegram.
Single message data (characteristics, current values) can be enquired via DSfG.
Certain properties are also adjustable via DSfG, such as hint limits and
gradients
4
.
In order to simplify the monitoring of up to 64 messages, single messages can
be combined by parameterisation in up to 8 groups in any composition
whatever. Each group generates 3 different messages that are created by
linking the single messages contained in that group. This way, the operator is
able to monitor the status of content-related messages without getting lost in the
observation of single messages.
The different message types of a group are called:
Group message
,
Held group
message
and
Centralized message
.
Group message
A group’s group message results from the OR operation of the single
messages belonging to the group. Thus, a group message is pending if at
least one of the messages of the group is pending.
A group message is not linked with an acceptance.
4
The DSfG data elements for message processing are included in the DSfG data element
tree of the
Control
entity. Please ask FLOW COMP for a precise list of the supported or
used DSfG data elements, when required.