7.45
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
Passwords can contain as many as 12 characters. Upper- and lowercase letters
are treated as different characters. Strong passwords consist of 12 characters,
with at least one special character or digit and mixed-case sensitivity, but do
not form a name, date, acronym, or word. Passwords formed in this manner
are less susceptible to password guessing and automated attacks.
Examples of valid, distinct, and strong passwords are as follows:
➤ #0t3579!ijd7
➤ (Ih2dcs)36dn
➤ $A24.68&,mvj
➤ *4u-Iwg+?lf-
PING Command
When you are setting up or testing substation networks, it is helpful to
determine if the network is connected properly and if the other devices are
powered up and configured properly. The PING command (Access Level 2)
allows a user of the relay to determine if a host is reachable across an IP
network and/or if the Ethernet port (Port 1) is functioning or configured
correctly. A typical PING command response is shown in Figure 7.29.
The command structure is:
PING x.x.x.x t
where:
x.x.x.x is the Host IP address and
‘t’ is the PING interval in seconds, with a 2 to 255 second range.
The default PING interval is one second when ‘t’ is not specified. The relay
sends ping messages to the remote node until you stop the PING test by
pressing the ‘Q’ key.
PULSE Command
Use the PULSE command (see Table 7.36) to pulse any of the relay control
outputs for a specified time. This function aids you in relay testing and
commissioning. When a PUL command is issued, the selected contact closes
or opens depending on the output contact type (a or b). The PUL command
energizes the coil and has no effect if the coil is already energized. The control
outputs are OUTnnn, where nnn represents 101–103 (standard), 301–304
(optional), 401–404 (optional), or 501–504 (optional).
==>>PING 10.201.7.52 <Enter>
Press the Q key to end the ping test.
Pinging 10.201.7.52 every 1 second(s):
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Reply from 10.201.7.52
Ping test stopped.
Ping Statistics for 10.201.7.52
Packets: Sent = 7, Received = 6, Lost = 1
Duplicated = 0
==>>
Figure 7.29 PING Command Response
NOTE: The PULSE command is
available when the breaker control
jumper on the mainboard is in the
ENABLED position.
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