U.2.21
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Installation
Jumpers
Step 12. Follow your company standard procedure to return the relay to
service.
I/O Interface
Board Jumpers
Jumpers on the I/O interface boards identify the particular I/O board
configuration and I/O board control address. Three I/O interface boards are
available: INT1, INT5, and INT6 (see I/O Interface Boards on page 2.12 for
more information on these boards). The jumpers on these I/O interface boards
are at the front of each board, as shown in Figure 2.15 on page 2.22,
Figure 2.16 on page 2.23, and Figure 2.17 on page 2.24.
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