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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  3.1.2 Active
  Active alarm state in which the alarm condition is true Note 1 to entry: This definition is copied from ISA 18.2 / IEC 62682 . Note 2 to entry: Other common terms ... defined by EEMUA Publication 191 are "Standing" for an Active Alarm and "Cleared" when the Condition has returned to normal and is no longer Active
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  3.1.1 Active Server
  Active Server Server which is currently sourcing information Note 1 to entry: In OPC UA redundant systems, an Active Server is the Server that a Client is using
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.6.2.4.5.2 Cold
  connect to one Server at a time. When the Client loses connectivity with the Active Server it will attempt a connection to the redundant Server (s) which ... There may be a loss of data from the time the connection to the Active Server is interrupted until the time the Client gets Publish Responses from the backup Server
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.6.2.4.5.3 Warm
  MonitoredItems on more than one Server, but sampling and publishing can only be active on one Server . However, the active Server will return actual data, whereas the other Servers ... error for the MonitoredItems in the Publish response such as Bad_NoCommunication. The one Active Server can be found by reading the ServiceLevel Variable from all Servers . The Server with
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.3 Acknowledgeable Conditions
  example, in typical Alarm models the change is limited to a transition to the Active state or transitions within the Active state. More complex models however can also allow
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.4 Previous states of Conditions
  acknowledgement process. In certain environments, it is required to acknowledge both the transition into Active state and the transition into an Inactive state. Systems with strict safety rules sometimes require ... that every transition into Active state is acknowledged. In situations where state changes occur in short succession there can be multiple unacknowledged states and the Server maintains ConditionBranches
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.5 Condition state synchronization
  reported. This means for example that Clients are not informed of currently Active Alarms until a new state change occurs. Clients can obtain the current state of all Condition instances
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.8 Alarms
  Alarms Alarms are specializations of AcknowledgeableConditions that add the concepts of an Active state and other states like Shelving state and Suppressed state to a Condition . The state model ... defined in 5.8 . Figure 5 - Alarm state machine model An Alarm in the Active state indicates that the situation the Condition is representing currently exists. When an Alarm
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.9 Multiple active states
  Multiple active states In some cases, it is desirable to further define the Active state of an Alarm by providing a sub-state machine for the Active State. For example ... multi-state level Alarm when in the Active state may be in one of the following sub-states: LowLow, Low, High or HighHigh. The state model is illustrated in Figure
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.2 AlarmConditionType
  returned to a normal state. The transitions of Conditions to the inactive and Active states are triggered by Server specific actions. Subtypes of the AlarmConditionType specified later in this document ... will have sub-state models that further define the Active state. Recommended state names are described in A.1 . In the event of a restart of an AlarmManager , the AlarmManager shall
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.12 RemoveFromService Method
  Method applies to an Alarm instance, even if it is not currently in the Active State . Table 62 specifies the AddressSpace representation for the RemoveFromService Method . Table 62 - RemoveFromService Method
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.13 RemoveFromService2 Method
  Method applies to an Alarm instance, even if it is not currently in the Active State . Table 65 specifies the AddressSpace representation for the RemoveFromService2 Method . Table 65 - RemoveFromService2 Method
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.14 PlaceInService Method
  Method applies to an Alarm instance, even if it is not currently in the Active State . Table 67 specifies the AddressSpace representation for the PlaceInService Method . Table 67 - PlaceInService Method
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.15 PlaceInService2 Method
  Method applies to an Alarm instance, even if it is not currently in the Active State . Table 70 specifies the AddressSpace representation for the PlaceInService2 Method . Table 70 - PlaceInService2 Method
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.16 GetGroupMemberships Method
  Method applies to an Alarm instance, even if it is not currently in the Active State . Table 72 specifies the AddressSpace representation for the GetGroupMemberships Method . Table 72 - GetGroupMemberships Method
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.17.1 Overview
  activity. In OneShotShelving , a user requests that an Alarm be Shelved for its current Active state or if not Active its next Active state. This type of Shelving is typically ... Condition is jumping between High Alarm and HighHigh Alarm , always in the Active state). The OneShotShelving will automatically clear when an Alarm returns to an inactive state. Another
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.19.2 ExclusiveLimitStateMachineType
  that represents the actual level of a multilevel Alarm when it is in the Active state. The sub state machine defined here includes High , Low , HighHigh and LowLow states. This ... used as a sub state machine for a state machine which has an Active state. This Active state could be part of a "level" Alarm or "deviation
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.24.2 OffNormalAlarmType
  used to indicate that a discrete value is in an Alarm state, it is active as long as a non-normal value is present. Table 106 - OffNormalAlarmType definition Attribute Value ... Property is not equal to the value of the NormalState Property the Alarm is Active . If this Variable is not in the AddressSpace , a NULL NodeId shall be provided
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.13 Alarm & Condition status codes
  requested shelved state. Bad_DialogNotActive The DialogConditionType instance is not in Active state. Bad_DialogResponseInvalid The selected option is not a valid index in the ResponseOptionSet array. Bad_EventIdUnknown
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  B.1.3 Server maintains previous states
  illustrates the use of branches by a Server requiring acknowledgement of all transitions into Active state, not just the most recent transition. In this example no acknowledgement is required ... Table B.2 - Example of a Condition that maintains previous states via branches EventId BranchId Active Acked Confirmed Retain Description a) NULL False True True False Initial state of Condition