OPC attribute Meaning in the PCS 7 OS message system
InfoText Displays the information text for the message.
LoopInAlarm States if LoopInAlarm has been configured.
ClassID Displays the message class ID.
Type ID Displays the message type ID.
AG_Number Displays the number of the automation device that generated the message.
CPU_Number Displays the number of the CPU that generated the message.
Duration Displays the period of time between message received, sent and acknowledged.
QuitStateText Indicates whether the message has been acknowledged.
Priority Indicates the configured priority of the message.
OS EVENT ID Displays the message number.
IEVENT UNIQUE EVENT ID Displays the unique event ID across all messages.
OS-HIDDEN Indicates whether a message configured with the "alarm hiding" function is shown
(yes/no).
HIDDEN-COUNT Indicates the number of messages currently hidden with the "alarm hiding" function
(HIDDEN).
6.5.7 Acknowledgment concept
Mapping the acknowledgment concept
In the PCS 7 OS, the acknowledgment concept is how a message is displayed and processed
from "came in" to "went out". On the OPC A&E server, this message status is displayed in the
"ChangeMask" and "NewState" parameters.
Condition-related event, simple event and tracking event
Messages with acknowledgment are sent from the system to the client as condition-related
events. Before a message is treated as a simple event, the message class of the message
must meet the following conditions:
● "Acknowledgment came in" is not activated.
● Message without status "went out" is activated.
The following messages are sent as tracking events in PCS 7:
● Messages of the "Operation message" message class.
● Messages of "System, does not require acknowledgment" message class with the
"Operation message" message type.
NOTICE
Messages with "System, does not require acknowledgment" message class and "Process
control system" message type are transferred as simple events with the "System
message" event category.
OpenPCS 7 interface
6.5 OPC Alarms and Events (OPC A&E)
OpenPCS 7
Function Manual, 05/2012, A5E02780178-02 61
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