Schweitzer Engineering Laboratories SEL-251 - Page 75

Date Code 970103 Communications 3-17
SEL-251, -2, -3 Instruction Manual
Table 3.3: Target LED Assignments
LED: 1 2 3 4 5 6 7 8
n
0 INST A B C Q N RS LO Front Panel Targets
1 51P 50L 50H 51QP 50Q 51NP 50NL 50NH Relay Word row R1
2 51T 50LT 50C 51QT 50QT 51NT 50NLT 27 Relay Word row R2
3 79RS 79CY 79LO 79SH 52AT 52BT IN6 IN5 Relay Word row R3
4 PDEM QDEM NDEM TF CF TCMA ST TRIP Relay Word row R4
5 A B C D E F G H Relay Word row R5
6 J KT !L V W X Y ZT Relay Word row R6
7 IN6 IN5 IN4 IN3 IN2 IN1 Inputs
8 TRIP CLOSE A1 A2 A3 A4 ALRM Output Contacts
These selections are useful in testing, checking contact states, and reading targets remotely. "1"
indicates an asserted element; "0" indicates a deasserted element.
The optional command parameter k selects the number of times the relay displays target data for
parameter n. The example below shows a series of ten target readings for Relay Word row R3.
Target headings repeat every eight rows. You cannot use parameter k without parameter n.
=>TARGET 3 10 <ENTER>TARGET 3 10 <ENTER>
79RS 79CY 79LO 79SH 52AT 52BT IN6 IN5
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
79RS 79CY 79LO 79SH 52AT 52BT IN6 IN5
1 0 0 0 1 0 1 1
1 0 0 0 1 0 1 1
=>
When you are finished, type TAR 0 <ENTER> to return to the functions marked on the front
panel so field personnel do not misinterpret displayed data.
When a serial port times out (see TIME1, TIME2 settings) and an automatic message is sent to
that port, the relay automatically clears the targets and displays the TAR 0 data.
Press the front panel TARGET RESET button to clear the TAR 0 data and illuminate all target
LEDs for a one second lamp test.
If you place the relay in service with a target level other than Level 0, it automatically returns to
target Level 0 when an automatic message transmits to a timed out port. While this feature