4.193
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
61850 Communications, Appendix G: IEC 60870-5-103 Communications,
Appendix H: DeviceNet Communications, Appendix I: Synchrophasors, and
Appendix J: M
IRRORED BITS Communications.
Use the MBT option if you are using a Pulsar MBT9600 baud modem (see
Appendix J: M
IRRORED BITS Communications for more information). With this
option set, the relay transmits a message every second processing interval and
the device deasserts the RTS signal on the EIA-232 connector. Also, the
device monitors the CTS signal on the EIA-232 connector, which the modem
deasserts if the channel has too many errors. The modem uses the device RTS
signal to determine whether the MB or MB8 M
IRRORED BITS protocol is in
use.
The relay EIA-232 serial ports support software (XON/XOFF) flow control. If
you want to enable support for hardware (RTS/CTS) flow control, set the
RTSCTS setting equal to Y.
On Ports F, 1, 2, 3, and 4, when PROTO := SEL, use the LANG setting to
communicate with the relay in English or Spanish. Refer to the SEL-751 Relay
Command Summary for the commands.
Set the AUTO := Y to allow automatic messages at a serial port.
Set FASTOP := Y to enable binary Fast Operate messages at the serial port.
Set FASTOP := N to block binary Fast Operate messages. Refer to
Appendix C: SEL Communications Processors for the description of the
SEL-751 Fast Operate commands.
Set PROTO := DNET to establish communications when you use the Devi-
ceNet card. Table 4.89 shows the additional settings, which can be set only at
the rear on the DeviceNet card. Once the relay detects the DeviceNet card, all
Port 4 settings are hidden. Refer to Appendix H: DeviceNet Communications
for details on DeviceNet.
Front-Panel Settings (SET F Command)
General Settings
The SEL-751 supports various front-panel options (see Table 1.4). This sec-
tion covers all of the front-panel related settings, except the touchscreen dis-
play settings. Refer to Table 9.5 for the touchscreen display settings. The
touchscreen display settings are not settable via the SET F command.
Local bits provide control from the front panel (local bits), and display points
display selected information on the LCD display. However, you need to first
enable the appropriate number of local bits and display points necessary for
your application. When your SEL-751 arrives, four display points are already
enabled, but no local bits are enabled. If more display points are necessary for
your application, use the EDP setting to enable as many as 32 display points.
Use the ELB setting to enable as many as 32 local bits. The EDP setting and
the corresponding display point settings are not available for the touchscreen
display model. The touchscreen display model provides you with the ability to
Table 4.89 Rear-Panel DeviceNet Port Settings
Setting Name Setting Range
MAC_ID 0–63
ASA 8 Hex characters assigned by factory
DN_Rate 125, 250, 500 kbps
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