Date Code 20011026 Communications 3-5
SEL-321/321-1 Instruction Manual
A multilevel password system provides security against unauthorized access. There are four
access levels:
Access Level 0 - On power-up the relay is in Access Level 0 and honors only the
ACCESS command, which moves to Access Level 1. Relay
responds "Invalid Command" or "Invalid Access Level" to any other
entry.
Access Level 1 - Allows access to only those commands listed under Access Level 1
in Figure 3.1.
Breaker Access Level - Allows access to CLOSE, OPEN and GROUP commands in addition
to Access Level 1 commands.
Access Level 2 - Allows access to COPY, PASSWORD, TARGET, and SET com-
mands plus all commands at lower levels.
This access scheme allows you to give personnel access to only those functions they require.
Each level has an associated screen prompt and password. Figure 3.1 shows the access levels,
passwords, prompts, commands available from each access level, and commands that move you
between access levels.
Figure 3.1: Access Level Relationships
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