Sel 751A - Hidden (no Display); Table 4.60 Settings that Always, Never, or Conditionally Hide a Display Point

4.113
Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
text you enter for Alias, Set String, or Clear String contains commas or spaces.
For example, DP01 = Name,Text is valid, but Name, Alias 3 is not valid
(contains a space). Correct the Alias name by using the quotation marks:
Name, “Text 3”. You can customize the data display format by entering data in
selected strings only. Table 4.60 shows the various display appearances
resulting from entering data in selected strings.
Hidden (No Display)
A display point is hidden when settings are entered (DPn = XX, where n = 01
through 32 and XX = any valid setting), but nothing shows on the front-panel
display. Table 4.60 shows examples of settings that always, never, or
conditionally hide a display point.
Following are examples of selected display point settings, showing the
resulting front-panel displays. For example, at a certain station we want to
display the status of both HV and LV circuit breakers of Transformer 1. When
the HV circuit breaker is open, we want the LCD display to show:
TRFR 1 HV
BRKR: OPEN
, and when the HV circuit breaker is closed, we want the display to
show:
TRFR 1 HV BRKR: CLOSED. We also want similar displays for the LV
breaker.
After connecting a form a (normally open) auxiliary contact from the HV
circuit breaker to Input IN101 and a similar contact from the LV circuit breaker
to Input IN102 of the SEL-751A, we are ready to program the display points,
using the following information for the HV breaker (LV breaker similar):
➤ Relay Word bit—IN101
➤ Alias—TRFR 1 HV BRKR:
➤ Set String—CLOSED (the form a [normally open] contact
asserts or sets Relay Word bit IN101 when the circuit breaker is
closed)
➤ Clear String—OPEN (the form a [normally open] contact
deasserts or clears Relay Word bit IN101 when the circuit
breaker is open)
Table 4.60 Settings That Always, Never, or Conditionally Hide a Display Point
Programmable Automation Controller Setting Name Alias Set String Clear String Comment
DP01 := IN101,TRFR1,CLOSED,OPEN IN101 TRFR1 CLOSED OPEN Never hidden
DP01 := IN101,TRFR1 IN101 TRFR1 — — Never hidden
DP01 := NA — — — — Always hidden
DP01 := IN101,,, IN101 — — — Always hidden
DP01 := IN101,TRFR1,, IN101 TRFR1 — — Always hidden
DP01 := IN101,TRFR1,CLOSED, IN101 TRFR1 CLOSED — Hidden when IN101 is
deasserted
DP01 := IN101,"TRFR 1",,OPEN IN101 TRFR 1 — OPEN Hidden when IN101 is
asserted