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UT_ALARM_BEACON — Flash alarm numbers on a single lamp

UT_ALARM_BEACON — Flash alarm numbers on a single lamp

For sites with one fault lamp and no HMI. It steps through every active alarm in
turn and flashes its number, so a tech can read the fault code off the lamp.

Pins

Pin Type Default What to wire
in Enable BOOL TRUE FALSE: lamp off, Code 0; on again starts over
out Lamp BOOL
out Code INT Alarm number being shown (0 = none)
out Active BOOL Any alarm (also while Enable is off)
inout Alarms ARRAY[*] OF BOOL Alarm n = element n (write with coils)
inout Data UT_BEACON_DATA

Record UT_BEACON_DATA

Field Type Default Meaning
style UT_BEACON_STYLE UT_BEACON_COUNT UT_BEACON_COUNT: the number as that many short flashes. UT_BEACON_BINARY: long = 1, short = 0, most significant bit first
bits INT 6 Binary: bits shown (1..15). A number too big for bits uses as many as it needs
shortTime TIME T#250ms Short flash (count, and binary 0)
longTime TIME T#1s Long flash (binary 1)
gapTime TIME T#500ms Lamp off between flashes
pauseTime TIME T#3s Lamp off between numbers
steadyWhenNone BOOL FALSE Lamp on steady when no alarm is active (a "healthy" light); it goes off for gapTime before the first flash
code INT Status: same as Code
activeCount INT Status: alarms active

How it works

  • Alarm number = index − lower bound + 1, so ARRAY[0..9] element 0 is alarm 1.
  • After an idle spell it starts from the lowest active alarm, then shows each active
    alarm in turn and goes round again.
  • A number that has started is always finished, even if its alarm clears meanwhile;
    then it moves on. Changing style mid-number takes effect at the next number.
  • Each flash, gap and pause lasts at least one PLC scan, and is rounded up to whole scans.
Number Count Binary, 6 bits
1 1 short SSSSSL
9 9 short SSLSSL
31 31 short SLLLLL

Using it

VAR  Faults : ARRAY[1..20] OF BOOL;  END_VAR
Faults[1] := P1Overload;
Faults[2] := P2Overload;
Faults[3] := HighLevel;
Beacon(Enable := TRUE, Alarms := Faults, Data := BeaconCfg);
FaultLamp := Beacon.Lamp;
Last updated 2 hours ago
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