AF SDK Reference

AFSystemStateCode Enumeration

Save PDF

AFSystemStateCode Enumeration

Save PDF

Last UpdatedNov 18, 2025
3 minute read

This enumeration defines the values for the standard system enumeration set derived from the system digital code values in the PI Data Archive.

Namespace: OSIsoft.AF.Asset
Assembly: OSIsoft.AFSDK (in OSIsoft.AFSDK.dll) Version: 3.1.1.1182

Syntax

public enum AFSystemStateCode

Public Enumeration AFSystemStateCode

Dim instance As AFSystemStateCode

public enum class AFSystemStateCode

type AFSystemStateCode

Members

Member name	Value	Description
None	0	No state specified. This state should not be used to create a system state set.
AccessDenied	210	AccessDenied state.
NoSample	211	No Sample state.
NoResult	212	No Result state.
UnitDown	213	Unit Down state.
SampleBad	214	Sample Bad state.
EquipFail	215	Equip Fail state.
NoLabData	216	No Lab Data state.
Trace	217	Trace state.
DCSFailed	233	DCS Failed state.
BadOutput	237	Bad Output state.
ScanOff	238	Scan Off state.
ScanOn	239	Scan On state.
Configure	240	Configure state.
Failed	241	Failed state.
Error	242	Error state.
Execute	243	Execute state.
Filtered	244	Filtered state.
CalcOff	245	Calculations Off state.
IOTimeout	246	Interfaces use this state to indicate that communication with a remote device has failed.
SetToBad	247	Set To Bad state.
NoData	248	Data-retrieval functions use this state for time periods where no archive values for a tag can exist 10 minutes into the future or before the oldest mounted archive.
CalcFailed	249	Calculation Failed state.
CalcOverflow	250	Calculation Overflow state.
UnderRange	251	For float16 point types, this state indicates a value that is less than the zero for the tag.
OverRange	252	For float16 point types, this state indicates a value that is greater than the top of range (Zero+Span) for that tag.
PointCreated	253	This state is assigned to a tag when it is created. This is a tag's value before any value is entered into the system.
Shutdown	254	All tags that are configured to receive shutdown events are set to this state on system shutdown.
BadInput	255	Interfaces use this state to indicate that a device is reporting bad status.
BadTotal	256	Bad Total state.
NoAlarm	257	No Alarm state.
OverUCL	258	Over UCL state.
UnderLCL	259	Under LCL state.
OverWL	260	Over WL state.
UnderWL	261	Under WL state.
Substituted	298	Substituted state.
InvalidData	299	Invalid Data state.
ScanTimeout	300	Scan Timeout state.
No_Sample	301	No_Sample state.
ArcOffline	302	Used by data-retrieval functions to indicate a period of time not covered by any mounted archive.
Good	305	Good state.
Bad	307	Bad state.
Doubtful	308	Doubtful state.
WrongType	309	Wrong Type state.
Overflow_st	310	Overflow_st state.
InterfaceShut	311	Interface Shut state.
OutOfService	312	Out of Service state.
CommFail	313	Comm Fail state.
NotConnect	314	Not Connect state.
CoercionFailed	315	Coercion Failed state.
Snapfix	316	Snapfix state.
InvalidFloat	317	Represents Nan (Not a Number) in later some PI Data Archives.
FutureDataUnsupported	318	Future Data Unsupported state, which represents the return from a data access call (to a future tag) that is not supported.

Remarks

This enumeration defines the values for the standard system enumeration set returned from the AFEnumeration.SystemStateSet. These values can be used to lookup a system AFEnumerationValue using the GetBySystemStateCode(AFSystemStateCode) method.

AF SDK Reference