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OPC Recommended Properties

The Recommended Properties are divided into the following tables.

Recommended Properties Related to the Item Value

PropID

Description

100

"EU Units"
The engineering units for this item.

101

"Item Description"
A description of the item.

102

"High EU"
Present only for `analog' data. Represents the highest value likely to be obtained in normal operation. Also used by servers that support non-zero DeadbandPercent values for a group.

103

"Low EU"
Present only for `analog' data. Represents the lowest value likely to be obtained in normal operation. Also used by servers that support non-zero DeadbandPercent values for a group.

104

"High Instrument Range"
Represents the highest value that can be returned by the instrument.

105

"Low Instrument Range"
Represents the highest value that can be returned by the instrument.

106

"Contact Close Label"
Present only for `discrete' data. Represents a string to be associated with this contact when it is in the closed (non-zero) state.

107

"Contact Open Label"
Present only for `discrete' data. Represents a string to be associated with this contact when it is in the open (zero) state.

108

"Item Timezone"
The difference in minutes between the item's UTC Timestamp and the local time in which the item value was obtained. OPC Toolbox™ software does not use this property to adjust time stamps for an item.

109-199

Reserved for future use.

Recommended Properties Related to Operator Displays

PropID

Description

200

"Default Display"
The name of an operator display associated with this item.

201

"Current Foreground Color"
The COLORREF in which the item should be displayed.

202

"Current Background Color"
The COLORREF in which the item should be displayed.

203

"Current Blink"
Defines whether a display of this item should blink.

204

"BMP File"
Bitmap file associated with this item.

205

"Sound File"
.WAV or .MID file associated with this item.

206

"HTML File"
URL reference for this item.

207

"AVI File"
Video file associated with this item.

208-299

Reserved for future OPC use.

Recommended Properties Related to Alarm and Condition Values

PropID

Description

300

"Condition Status"
The current alarm condition status associated with the item.

301

"Alarm Quick Help"
A short text string providing a brief set of instructions for the operator to follow when this alarm occurs.

302

"Alarm Area List"
An array of strings indicating the plant or alarm areas which include this item.

303

"Primary Alarm Area"
A string indicating the primary plant or alarm area including this item.

304

"Condition Logic"
An arbitrary string describing the test being performed.

305

"Limit Exceeded"
For multistate alarms, the condition exceeded.

306

"Deadband"

307

"HiHi Limit"

308

"Hi Limit"

309

"Lo Limit"

310

"LoLo Limit"

311

"Rate of Change Limit"

312

"Deviation Limit"

313-4999

Reserved for future OPC use.

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