Schweitzer Engineering Laboratories SEL-421-4 - Page 827

3.9
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Basic Relay Operations
Access Levels and Passwords
WARNING
Communications Ports Access Levels
This device is shipped with default
passwords. Default passwords should
be changed to private passwords at
installation. Failure to change each
default password to a private pass-
word may allow unauthorized access.
SEL shall not be responsible for any
damage resulting from unauthorized
access.
Entrance to the higher security levels is sequential. You must first enter a correct
password to move from Access Level 0 to Access Level 1.
To enter Access Levels B, P, A, O, and 2, you must enter a correct password from
Access Level 1. For example, to go to the O (Output) Access Level from Access
Level 1, type OAC <Enter>. At the
Password: ? prompt, type your Access
Level O password.
To enter level C, you must enter a correct password from Access Level 2.
Use the relay QUIT command from any access level to return the relay to Access
Level 0. To reestablish control at a previous access level from Access Level 1,
you must use the access level commands and passwords to log in to that previous
access level.
When a connection with the relay times out, the relay reduces the access level to
Access Level 0 for that communications port connection.
The MAXACC port setting can be used to limit the maximum access level per-
mitted on a port. This can be useful to restrict what remote users can do.
Front-Panel Access Levels
The lowest access level for the front panel is Access Level 1. To enter Access
Levels B, P, A, O, and 2, you must enter a correct password from Access Level 1.
The front-panel LCD displays a password prompt when you attempt to control
the relay at any access level higher than Access Level 1. (For more information
on entering passwords from the front panel, see PASSWORD on page 14.42.)
The front-panel
MAIN MENU item RESET ACCESS LEVEL returns the relay to Access
Level 1. In addition, when the front-panel inactivity timer times out (indicated by
the
ROTATING DISPLAY on the front-panel LCD), the relay returns the front-panel
access level to Access Level 1.
ACCESS Command
NOTE: You can shorten relay
commands to the first three letters of
the full command.
Section 14: ASCII
Command Reference
for more
information.
Enter the ACCESS (ACC) command to change to Access Level 1. Passwords are
case sensitive; you must enter a password exactly as set.
If you enter the password correctly, the relay moves to Access Level 1 and the
Access Level 1 => prompt appears. If you are at a higher access level (B, P, A, O,
and 2), you can reduce the access level to Access Level 1 by entering the ACC
command. The relay performs no password validation to reduce the present
access level.
Higher Access Level Commands
Enter the commands in Table 3.3 to enter access levels above Access Level 1. For
example, enter the 2ACCESS (2AC) command to change to Access Level 2.
If you are presently at Access Level 1, B, P, A, or O, typing 2AC <Enter> causes
the relay to prompt you to type the Access Level 2 password. If the present level
is Access Level 0, the relay responds with
Invalid Access Level. The relay
pulses alarm Relay Word bit SALARM when entering Access Level B, P, A, O,
and 2 from a lower access level.