ABB LLT100, Functional Safety Manual

Page: 20 / 32

20
User Guide
Checklist before safety operation
The following items must be checked before safety operation:
• Before the first startup of the device, as a part of a safety function, check that the device
configuration fulfills the safety function of the system.
• Check that the right device is installed on the right measuring point.
• Make sure that the vessel empty (LRV) and vessel full (URV) parameters correspond to real values
with appropriate units.
• After every change to the device, as a part of a safety function, such as a change to the installation
position of the device, process type change or configuration of safety parameters, the safety
function of the device shall be verified (see “Verify safety function” on page 21).
• After the safety function has been checked, device operation must be locked because a change to
the measuring system or parameters can compromise the safety function. The
write protection
shall be enabled
before powering up when it is desired to go into safe operation.
Adding password protection
To allow only authorized personnel to modify the LLT100 configuration, and therefore the safety
function behavior, password protection must be added.
1 From the Device Setup menu, select Access Control > Advanced Password .
2 In the password edit screen, edit each password character.
3
Press
OK
.
4
Repeat steps 1 to 3 for Standard Password instead of Advanced Password.