Multiple alarms, one alarm bell

Nablar

Member
N
Join Date
May 2016
Location
Oslo
Posts
8
I have a huge list of alarms that triggers an alarm bell.
I am currently doing it this way (I have more than 4 alarms normally):

audioalarm.PNG


My question is this:
How can I make the same functionality in IL or ST?
If it is, I can later make a script that automates the process from Excel.
I have all the alarm variables in an Excel list.

Anny suggestions?

I am using a Schneider Electric M340 PLC and Unity Pro S V.11
 
In ST it would be something like

IF Alrm1 OR Alrm2 OR Alrm3 OR Alrm4 THEN
AlarmBell:=TRUE;
ELSE
AlarmBell:=FALSE;
END_IF;
 
First, Welcome to forum!

I would do this on FBD editor still.
This is one method, hopefully you know indirect addressing allready

attachment is Unity V10



Another method is array of words (alarms moved to words)
XOR alarm word with result of XOR result on last PLC scan. Trigger bell with result of XOR.
 
Last edited:
Lare said:
First, Welcome to forum!

I would do this on FBD editor still.
This is one method, hopefully you know indirect addressing allready

attachment is Unity V10



Another method is array of words (alarms moved to words)
XOR alarm word with result of XOR result on last PLC scan. Trigger bell with result of XOR.
Click to expand...


I'm at Unity V8. Any bugs w/ 10 or 11?
 
Lare said:
First, Welcome to forum!

I would do this on FBD editor still.
This is one method, hopefully you know indirect addressing allready

attachment is Unity V10



Another method is array of words (alarms moved to words)
XOR alarm word with result of XOR result on last PLC scan. Trigger bell with result of XOR.
Click to expand...

I love the XOR thingy by the way. Was trying to remember that. Any gotchas or tips on that?
 
grnick50 said:
Dear Lare,

Can you please post the example in a Pdf?

Regards
Click to expand...

Here is with screenshot

Key is to locate all alarms to consecutive bits so they can easily loop trought.

I maded this with adding index on every PLC scan, if there is more speed needed, then loop-while on ST is better.

XOR have similar princible for oneshot detection than on download section/Allen Bradley: (method 10)

http://www.plcs.net/downloads/index...TERNATOR METHODS.pdf&directory=Allen_Bradley&
 
Last edited:
Dear Lare. Thanx for posting the PDFs. I was about to comment on the speed issue of the alarm scanning but You got it covered.
 
Last edited:

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