Sel SEL-787 - Table 4.54 Settings that Always, Never, or Conditionally Hide a Display Point

4.99
Date Code 20150130 Instruction Manual SEL-787 Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
Boolean Display Point Entry Composition
Boolean information is the status of Relay Word bits (see Appendix J: Relay
Word Bits). In general, the legal syntax for Boolean display points consists of
the following four fields or strings, separated by commas:
Relay Word Bit Name, “Alias”, “Set String”, “Clear String”.
where:
Any or all of Alias, Set String, or Clear String can be empty. Although the
relay accepts an empty setting Name as valid, a display point with an empty
Name setting is always hidden (see below). Commas are significant in
identifying and separating the four strings. Use quotation marks only if the
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 4.54 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 4.54 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
Name = Relay Word bit name (IN101, for example). All binary
quantities occupy one line on the front-panel display (all
analog quantities occupy two lines).
Alias = A more descriptive name for the Relay Word bit (such as
TRANSFORMER 3), or the analog quantity (such as
TEMPERATURE).
Set String = State what should be displayed on the LCD when the
Relay Word bit is asserted (CLOSED, for example)
Clear String = State what should be displayed on the LCD when the
Relay Word bit is deasserted (OPEN, for example)
Table 4.54 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