AVEVA™ Communication Drivers

Special data types

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Special data types

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Last UpdatedAug 29, 2024
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Special data types include:

System data type
Hardware data type

These are used for special purposes through specific instructions in the controller. Their availability depends on the model of the controller. Some frequently used special data types are listed in the following table.

Note: Structure element names are predefined by the system and cannot be changed.

Data Format	Structural Element	Suffix	Data Type	Access	Value Range / Notes
AOM_IDENT			VT_UI4	Read/Write	0 to 4294967295
CONN_ANY			VT_UI2	Read/Write	0 to 65535
CONN_OUC			VT_UI2	Read/Write	0 to 65535
CONN_PRG			VT_UI2	Read/Write	0 to 65535
CONN_R_ID			VT_UI4	Read/Write	0 to 4294967295
CREF	<Structure>		N/A
Byte	.BLOCK_TYPE		VT_UI1	Read/Write	0 to 255
UInt	.CB_NUMBER		VT_UI2	Read/Write	0 to 65535
UDInt	.OFFSET		VT_UI4	Read/Write	0 to 4294967295
DB_ANY			VT_UI2	Read/Write	0 to 65535
DB_WWW			VT_UI2	Read/Write	0 to 65535
EVENT_ANY			VT_UI4	Read/Write	0 to 4294967295
EVENT_ATT			VT_UI4	Read/Write	0 to 4294967295
EVENT_HWINT			VT_UI4	Read/Write	0 to 4294967295
ErrorStruct	<Structure>		N/A
Word	.ERROR_ID		VT_UI1	Read/Write	0 to 255
Byte	.FLAGS		VT_UI1	Read/Write	0 to 255
Byte	.REACTION		VT_UI1	Read/Write	0 to 255
Byte	.MODE		VT_UI2	Read/Write	0 to 255
UInt	.OPERAND_NUMBER		VT_UI2	Read/Write	1970 to 2262
UInt	.POINTER_NUMBER_LOCATION		VT_UI1	Read/Write	1970 to 2262
UInt	.SLOT_NUMBER_SCOPE		VT_UI2	Read/Write	1970 to 2262
CREF	<Structure>		N/A
Byte	.CREF.BLOCK_TYPE		VT_UI4	Read/Write	0 to 4294967295
UInt	.CREF.CB_NUMBER		VT_UI1	Read/Write	1970 to 2262
UDInt	.CREF.OFFSET		VT_UI2	Read/Write	0 to 999999999
NREF	<Structure>		N/A
Byte	.NREF.AREA		VT_UI1	Read/Write	0 to 255
UInt	.NREF.DB_NUMBER		VT_UI2	Read/Write	1970 to 2262
UDInt	.NREF.OFFSET		VT_UI4	Read/Write	0 to 4294967295
HW_ANY			VT_UI2	Read/Write	0 to 65535
HW_DEVICE			VT_UI2	Read/Write	0 to 65535
HW_DPMASTER			VT_UI2	Read/Write	0 to 65535
HW_DPSLAVE			VT_UI2	Read/Write	0 to 65535
HW_HSC			VT_UI2	Read/Write	0 to 65535
HW_IEPORT			VT_UI2	Read/Write	0 to 65535
HW_INTERFACE			VT_UI2	Read/Write	0 to 65535
HW_IO			VT_UI2	Read/Write	0 to 65535
HW_IOSYSTEM			VT_UI2	Read/Write	0 to 65535
HW_MODULE			VT_UI2	Read/Write	0 to 65535
HW_PTO			VT_UI2	Read/Write	0 to 65535
HW_PWM			VT_UI2	Read/Write	0 to 65535
HW_SUBMODULE			VT_UI2	Read/Write	0 to 65535
NREF	<Structure>		N/A
Byte	.NREF.AREA		VT_UI1	Read/Write	0 to 255
UInt	.NREF.DB_NUMBER		VT_UI2	Read/Write	0 to 65535
UDInt	.NREF.OFFSET		VT_UI4	Read/Write	0 to 4294967295
OB_ANY			VT_I2	Read/Write	-32768 to 32767
OB_ATT			VT_I2	Read/Write	-32768 to 32767
OB_CYCLIC			VT_I2	Read/Write	-32768 to 32767
OB_DELAY			VT_I2	Read/Write	-32768 to 32767
OB_DIAG			VT_I2	Read/Write	-32768 to 32767
OB_HWINT			VT_I2	Read/Write	-32768 to 32767
OB_PCYCLE			VT_I2	Read/Write	-32768 to 32767
OB_STARTUP			VT_I2	Read/Write	-32768 to 32767
OB_TIMEERROR			VT_I2	Read/Write	-32768 to 32767
OB_TOD			VT_I2	Read/Write	-32768 to 32767
PIP			VT_UI2	Read/Write	0 to 65535
PORT			VT_UI2	Read/Write	0 to 65535
RTM			VT_UI2	Read/Write	0 to 65535
STRUCT	<Structure>		N/A
The STRUCT data type does not have a pre-defined name or member names. It represents a data structure composed of different data types. Any data type can be included in STRUCT. See the Siemens programming guidelines for additional information.

AVEVA™ Communication Drivers

Special data types

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Special data types

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