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Advanced - Controlling the security level from the PLC
By default, the I/O mode of the Protect object is set to Local.
However, if you want to control the security level from the PLC, this
can be changed.
Example:
- Users subscribing
to security level 2 are allowed to manipulate objects between 6:00 a.m.
– 15:00
- Users subscribing
to security level 3 are allowed to manipulate objects between 15:00 a.m.
– 23:00
- Users subscribing
to security level 4 are allowed to manipulate objects between 23:00 a.m.
– 6:00
This scenario can be accomplished by writing PLC code that changes the
security level at the specified time.
Before this can be done, the I/O mode of the Protect object and the
PLC address must be changed as follows:
- Use the Open by Name command to find the Protect
object and open its properties dialog box.
- On the Edit Mapping tab, do the following:
- Select
the State .
- In the
I/O mode drop-down, select In (incoming value from the PLC)
- Under
Driver, select the relevant driver.
- Specify
the relevant PLC address.
- If you want
to be able to change the security level from IGSS, perform step 2 for
the Command atom, only this time
choose Out as the I/O mode.
- Click OK to close the properties dialog box.
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