plc5 oil pit alarm logic - PLCS.net

tjoneill · March 20th, 2010, 07:49 AM

Hi again all..
I am having a little bit of a problem creating an alarm for a oil pit spill. I think im making it out to be harder that what it really is.
Here is what i have:
float contact=I:1/14
alarm reset PV pb=B3:0/11
alarm=n7:152/11
timer= T4:4
The float rises, and the contacts are made..alarm is on.
Hit reset,and the alarm shuts off for 20min then comes back on every 20 min until I:1/14 dropes out.
I must have brain lock,I should be able to creat the logic but keep finding flaws in it.
Thanks again

Eric Nelson · March 20th, 2010, 08:52 AM

Not exactly how I'd do it, but it should work...

Code:

|  float      tt                 alarm
|---] [---+---]/[-----------------(  )
|         |
|  alarm  |
|---] [---+
|
|  alarm     reset               timer
|---] [-------] [---+-------------(  )
|                   |
|   tt              |
|---] [-------------+

The "TT" bit is the timer's "Timer Timing" bit (T4:4/TT). I included the ALARM contact in the timer's rung so no one can 'anticipate' the alarm and start the 'silence' timer...

-Eric

tjoneill · March 22nd, 2010, 07:16 AM

Eric,
Works just fine....thx
Tim

March 20th, 2010, 07:49 AM	#1
tjoneill Member Join Date: Jul 2007 Location: Michigan Posts: 55	plc5 oil pit alarm logic Hi again all.. I am having a little bit of a problem creating an alarm for a oil pit spill. I think im making it out to be harder that what it really is. Here is what i have: float contact=I:1/14 alarm reset PV pb=B3:0/11 alarm=n7:152/11 timer= T4:4 The float rises, and the contacts are made..alarm is on. Hit reset,and the alarm shuts off for 20min then comes back on every 20 min until I:1/14 dropes out. I must have brain lock,I should be able to creat the logic but keep finding flaws in it. Thanks again

March 20th, 2010, 08:52 AM	#2
Eric Nelson Lifetime Supporting Member + Moderator Join Date: Apr 2002 Location: Randolph, NJ Posts: 4,092	Not exactly how I'd do it, but it should work... Code: \| float tt alarm \|---] [---+---]/[-----------------( ) \| \| \| alarm \| \|---] [---+ \| \| alarm reset timer \|---] [-------] [---+-------------( ) \| \| \| tt \| \|---] [-------------+ The "TT" bit is the timer's "Timer Timing" bit (T4:4/TT). I included the ALARM contact in the timer's rung so no one can 'anticipate' the alarm and start the 'silence' timer... -Eric

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March 22nd, 2010, 07:16 AM	#3
tjoneill Member Join Date: Jul 2007 Location: Michigan Posts: 55	Eric, Works just fine....thx Tim

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