Siemens C79000-G8976-C156-07 User Manual

247

Commissioning PC Stations - Manual and Quick Start
Release 5/2005

C79000-G8976-C156-07

OPC ItemIDs

Unique name of the OPC item.

Value

Value of the variable displayed in the format set in the Format column.

Format

Representation

For integers, you can select between the original format,
hexadecimal, or binary. The “Original” format for integers is decimal.
All values that are not integers are always displayed in the original
format (for example, string, date, floating point). It is not possible to
change the format of these data types.

Type

Canonical data type of the OPC item.

Access

Access rights for the OPC item. ( “R”= read-only, “W”= write-only,
“RW” = full access)

Quality

Qualifies the accuracy of the value. If the quality is “good”, the value
was acquired with certainty.

Time Stamp (UTC)

Time at which the OPC Server last detected a change in the value.
The time stamp is displayed in UTC format (Universal Coordinated
Time). The UTC time corresponds to Greenwich Mean Time (GMT).

Write Result

Result of the last write to this OPC item.

Group

Name of the group containing this OPC item.

Client Handle

Handle of the OPC item assigned by the client.

Server Handle

A handle assigned by the server.

Error

Error messages involving the use of the OPC item that cannot be
attributed to “Quality” or “Write Result”.

 

You can display the attributes of individual OPC items.

1.

Select the OPCItemIDs of the variables whose attributes you want to display in the variable
display.

2.

Open the Item menu and select the Properties menu command.

A dialog opens displaying the basic properties.

3.

Click the Query Available Properties button.

A dialog opens in which all the properties are displayed.