Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Uživatelský manuál stáhnout pdf (Strana 79)

Data access control Chapter 4

2. In the Parameter/Local Tag Properties dialog box, select the Constant

check box.

3. Click OK.

See Constant check box availability on page 80

for considerations.

Designate a constant in the Tag Editor

The Constant column in the Tag Editor lets you designate tags that cannot be

modified in the Logix Designer program. The Constant property applies to an

entire tag; all members of the tag take on the same setting. The Constant column

cells are blank for members of the constant tag.

An error message appears if you try to change the data type of a constant tag to a

data type that cannot be constant.

Follow these steps to add a constant value in the Tag Editor.

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Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Uživatelský manuál Strana 79