Tag Access (Read vs. ReadWrite)

While you can configure a Job Tag with an Access Level of ReadWrite, this does not necessarily mean that an OPC client can successfully write data to the In-Sight spreadsheet cell associated with tag.

The ability of OPC clients to read data from or write data to spreadsheet cells on In-Sight sensors depends on the following factors:

• Tag Access Level
• OPC User Access Level
• The function or formula contained in the spreadsheet cell

Tag Access Level

Values of tags with an Access Level of Read may only be retrieved from an OPC client. Values of tags with an Access Level of ReadWrite may be retrieved or set by an OPC client.

OPC User Access Level

When setting up a configuration, you may establish a default logon or individual logons for each sensor. The User Names and Passwords set up in the OPC configuration must match valid User Names and Passwords that exist on each sensor and have the desired Access Level to edit the contents of spreadsheet cells on the sensor(s) in the configuration.

Refer to the In-Sight Explorer help file for more information regarding User Access Levels on In-Sight sensors.

Spreadsheet Functions

In-Sight spreadsheet cells containing one of the following functions may be written from an OPC client:

• EditFloat
• EditInt
• EditString

If a Job Tag is moved to a different spreadsheet cell, the Access Level remains unchanged. Any cell that does not contain an EditFloat, EditInt or EditString function cannot be written by an OPC client, regardless of the Access level assigned to the OPC tag in the In-Sight OPC Classic Server.