Demo3D 2025 API Documentation
Demo3D Namespaces
Demo3D.PLC Namespaces
Demo3D.PLC.Comms Namespaces
Demo3D.PLC.Comms
AccessParameters Class
AccessRights Enumeration
AddressArea Structure
Alignment Class
Alignment.Packed Class
Alignment.Sequential Class
Alignment.Sequential16 Class
Alignment.Sequential32 Class
Alignment.Sequential64 Class
BrowseFlags Enumeration
BrowseItemBase Class
BrowseItemBase.SearchFlags Enumeration
BrowseItemBranch Class
BrowseItemExtensions Class
BufferMarshaller(T) Class
CanModifySymbolFlags Enumeration
CanReadSymbolsFlags Enumeration
ConversionDelegate Delegate
ConversionFunction Class
DataArray(T) Class
DataArray(T).IndexRange Structure
DataArray(T).ValueChange Structure
DataContextProvider Class
DataConverter Class
DataConverterAttribute Class
DataDimension Structure
DataStruct Class
DataType Class
DataType.Builder Class
DataType.ConvertibleFlags Enumeration
DataType.FieldItem Class
DataType.MemoryLayout Class
DataValue Structure
DataValue(T) Structure
FieldDescriptor Class
FieldOffsetBitsAttribute Class
FieldSizeBitsAttribute Class
IAddress Interface
IAddressSpace Interface
IAddressTranslatorService Interface
IBrowseItem Interface
IBrowseItemDescription Interface
IConnectionPoint Interface
IDataContextProvider Interface
IDataRefreshService Interface
IListExt Interface
IModifySymbolTable Interface
INotifySymbolTable Interface
IOAsyncDelegate(T) Delegate
IOBeforeHandler Delegate
IOControl Enumeration
IOErrorHandler Delegate
IOffloadingService Interface
IOSuccessHandler Delegate
ISymbolTable Interface
ISynchronizedCoSimulator Interface
ISynchronizedIOService Interface
MemoryAddress Class
MemoryAddress.MemoryAddressConverter(AddressType) Class
MemorySymbolTable(AddressType) Class
MessageContextBase Class
MetaProperties Class
MetaPropertyDatabase Class
MetaPropertyDescriptor Class
PlcFlags Enumeration
StringAddress Class
TypedMemoryAddress Class
VectoredRequest Class
VectoredRequests Class
Click or drag to resize

IOControl Enumeration

Cache and IO control flags.

Namespace:  Demo3D.PLC.Comms
Assembly:  PLC (in PLC.dll) Version: 18.03.00
Syntax
C#
Copy
[FlagsAttribute]
public enum IOControl
Members
  Member nameValueDescription
None0 No IO control.
WriteThrough1 When the model changes the state of a tag (eg sets a custom property), then the model is suspended until the new tag data has been written to the server (and depending on the tag server, a response has been received).
DontWriteThrough2 Explicity turns off WriteThrough.
DontPreserveUpdates4 Allow updates to be discarded, only reading/writing snapshots of the data.
PreserveValueUpdates8 Always ensure that every change in tag value is read/written.
PreserveAllUpdates16 Always ensure that every tag update (even those with the same value) is read/written. Also ensures that no updates apart from explicit writes from the model are written.
AllowMerge32 Allow data from this item to merge with data from other items in IO to/from the server.
DontAllowMerge64 Force data from this tag to be read/written to the PLC as a distinct IO request.
FastScanRate128 Assume this tag requires a fast scan rate, even if a fast scan rate hasn't been explicitly configured.
DontAllowMergeNCReads256 Don't allow merging read requests with neighbouring unassigned memory.
DontAllowMergeNCWrites512 Don't allow merging write requests with neighbouring unassigned memory.
See Also