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Interface Health Points
42
General Interface Health Tags
The general interface health tags pertain to the operation of the interface in general. A list of
scan class health tags follows. The scan class health tags require a valid scan class be
configured in Location4 of the Historian tag. The general Interface Health tags do not
consider the Location4 value.
Heartbeat
ExDesc Keyword: [UI_HEARTBEAT]
Update Interval: Once a second or based on scan class as described below.
Description:
The heartbeat tag is the primary tag used to determine if the interface is running. If the value
of the heartbeat tag is updating, then the interface is running but not necessarily connected to
and collecting data from a data source. The default update interval is 1 second if there are no
scan classes defined for the interface. If the interface has defined scan classes, the update
interval will be set to the highest frequency (lowest value) scan rate with the following
limitations. If the scan rate is less than 1 second, the update interval will be set to 1 second. If
the scan rate for the highest frequency scan class is greater than 1 minute, the update interval
will be set to 60 seconds. The value written to the heartbeat tag increments from a value
starting at 1, increments to a value of 15 and then restarts at 1.
The heartbeat tag will stop updating if the interface is shut down or if the interface is in a
deadlock situation.
Note: The Interface Health Heartbeat tag is completely separate from the UniInt
Failover Heartbeat tag. An interface can have both an Interface Health Heartbeat tag
and a UniInt Failover Heartbeat tag loaded simultaneously.
Scan Class Information
ExDesc Keyword: [UI_SCINFO]
Update Interval: Once at interface startup and each performance summary interval.
Description:
The Scan Class Information Tag is a string tag that contains the number of scan classes used
by the interface and their associated scan rates. The Heartbeat scan rate is also included in
the string. The tag is updated once at interface startup and at each performance interval.
As an example, the value for the Scan Class Information tag for an interface with three scan
class of 5 seconds, 10 seconds and 60 seconds will be ―3 | 5 | 5 | 10 | 60‖. The first number is
the number of scan classes and the second number is the Heartbeat update rate. The numbers
that follow the Heartbeat depend on the rate and number of scan classes defined. Each scan
class rate will be written in seconds.
- UNIINT INTERFACE USER MANUAL 1
- Table of Contents 3
- Introduction 7
- Running Modes 10
- Informational Parameters 10
- Standard Parameters 11
- is when the 14
- Interface Startup Parameters 20
- /updateinterval=# 20
- What are Historian Points? 21
- Interface Points 21
- Point Attributes 22
- Input Points 28
- Output Points 29
- I/O Rate Points 31
- Performance Points 32
- Performance Summaries 33
- UniInt and PI SDK 33
- “Known Servers” Table 34
- Interface Operation 35
- Historian Point Updates 36
- Exit Handler 36
- Windows Performance Counters 39
- UniInt Performance Counters 41
- directory 44
- Interface Health Points 45
- Interface Point Count 49
- IO Rate 49
- Message Counter 50
- Output Rate 50
- Output Bad Value Rate 50
- Trigger Input Rate 51
- Trigger Input Bad Value Rate 51
- Scan Class Health Tags 51
- Scan Class Scan Time 54
- Operating Systems 55
- Interface 56
- Buffering 56
- Limitations 58
- Outputs 59
- ICU Configuration 61
- Operation 66
- Creation 67
- Validation 68
- Construction 68
- Utilization 69
- Synchronization 70
- Remote Cache Builds 71
- Messages 72
- Configuration Errors 74
- Troubleshooting 76
- 3. Delete the cache files 77
- Configuring UniInt Failover 81
- Data Source Points 82
- Historian Tags 83
- Historian Tag 84
- Description 84
- Steady State Operation 87
- Glossary 88
- Failover ID 89
- Failover Update Interval 89
- Heartbeat Point 89
- Hot Failover 89
- Input Data 90
- Failover Scenarios 91
- Manual Failover 96
- UniInt Failover Scheme 100
- Maximum Data Overlap 103
- Message Logs 105
- Messages on Windows 105
- System Errors and PI Errors 105
- Definition of, 2 107
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