7.42
SEL-751 Relay Instruction Manual Date Code 20170927
Communications
Communications Protocols
error-free data are received. The LOO command, with just the channel
specifier, enables loopback mode on that channel for five minutes, while the
inputs are forced to the default values.
If only one M
IRRORED BITS port is enabled, the channel specifier (A or B) can
be omitted. To enable loopback mode for other than the 5-minute default,
enter the number of minutes (1–5000) you want as a command parameter. To allow
the loopback data to modify the RMB values, include the DATA parameter.
To disable loopback mode before the selected number of minutes, re-issue the
LOO command with the R parameter. The R parameter returns the device to
normal operation. If both M
IRRORED BITS channels are enabled, omitting the
channel specifier in the disable command causes both channels to be disabled.
MAC Command
Use the MAC command to display the MAC addresses of PORT 1, as shown in the
following.
MET Command (Metering Data)
The MET command (see Table 7 .31 and Ta bl e 7. 32) provides access to the
relay metering data.
=>>LOO A <Enter>
Loopback will be enabled on Mirrored Bits channel A for the next 5 minutes.
The RMB values will be forced to default values while loopback is enabled.
Are you sure (Y/N)?
=>>
=>>LOO 10 DATA <Enter>
Loopback will be enabled on Mirrored Bits channel A for the next 10 minutes.
The RMB values will be allowed to change while loopback is enabled.
Are you sure (Y/N)? N <Enter>
Canceled.
=>>
=>>LOO R <Enter>
Loopback is disabled on both channels.
=>>
=>>MAC <Enter>
Port 1 (IP) MAC Address: 00-30-A7-67-32-10
Port 1 (GOOSE) MAC Address: 00-30-A7-78-10-20
=>>
NOTE: Relays with older CPU cards
can be upgraded to firmware
versions R112 or higher, but the relay
will not have the GOOSE
performance improvements (i.e., a
GOOSE port with a dedicated MAC
address).
Ta b l e 7. 3 1 Me te r Co mm a n d
Command Description Access Level
MET c n Displays metering data. 1
MET c R Resets metering data. 1
Parameters
c Parameter for identifying meter class.
n Parameter used to specify number of times (1–32767) to repeat the
meter response.
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