Global system items

System Item Name (Type)

Type/Access Rights

Description

Values

$SYS$Licensed

Boolean/Read

Binary status indication of the existence of a valid license.

If FALSE, this item causes the Communication Driver to stop updating existing tags, to refuse activation of new tags, and to reject write requests in addition to setting quality for all items to BAD.

If TRUE, the Communication Driver functions as configured.

All instances have the same value.

RANGE: 0, 1

1: Valid license exists.

0: No valid license exists.

$SYS$ReadOnly

Boolean/Read

Binary status indication of the Read Only state.

If TRUE, the Read/Write access of all items are overridden to read only and cannot be written. If an item is written, a line is logged in the OCMC Logger and the write request is rejected.

If FALSE, the Communication Driver items are read/write or read only according to their individual configurations.

Range: 0, 1

1: Read only

0: Not read only