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Old May 6th, 2013, 09:20 PM   #5
Ron Beaufort
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Join Date: Jul 2002
Location: Charleston, SC
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not sure if this is what you're looking for but there are some ideas for basic alarms in the attached file ... it was written for an SLC-500 platform but should be easily modified for anything else ...

basic ideas:

each field signal gets three separate timers ...

(1) you get to tweak the first timer to determine how long each signal can be "out of tolerance" before you consider the field input signal to be in an "alarm state" ...

(2) you get to tweak the second timer to determine how long each signal must be back "within tolerance" before you consider the "alarm state" to be cleared ...

(3) you get to tweak the third timer to determine how long an alarm state may be silenced before the horn turns back on again to remind (nag) the operator that an "alarm state" still exists ...

so ...

whenever a "new" alarm state is declared, a horn sounds and a beacon lights up to alert the operator that an alarm condition exists ...

the operator can press the "silence" button in order to concentrate on correcting the condition so the horn turns off but the beacon stays on ...

if the condition doesn't get corrected in a timely manner, the horn sounds again to remind the operator that something still needs to be done ...

naturally some field conditions require very prompt attention ... others can go quite awhile before things get serious ... and some operators might just press the silence button repeatedly and go right back to sleep ... the basic ideas in this program give a lot of flexibility in how different types of "alarms" are handled ...

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Attached Files
File Type: pdf ALARMS.pdf (34.1 KB, 147 views)
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