You could use a bit of code to generate the "blink" signal and then "AND" that
signal individually with each of your lights.
Example:
STEP 01 ;Blink Code
STEP 02 LAC M01
STEP 03 NOT
STEP 04 OSP 1
STEP 05 STM M01
STEP 06 NOT
STEP 07 OSP 1
STEP 08 STM M01
STEP 09
STEP 10 ;AND the inputs with the blink
STEP 11 IN BI01 ;request for 1st light
STEP 12 AND M01 ;blink signal
STEP 13 OUT BO01 ;flash the light
STEP 14
STEP 15 IN BI02 ;request for 2nd light
STEP 16 AND M01 ;blink signal
STEP 17 OUT BO02 ;flash the light
Et cetera
The CALCA block only has 8 Boolean outputs, so I considered exporting the blink
on one of the outputs. But, since it was going to require a second CALCA
anyway, I thought that putting 5 lights in the first CALCA block and then
cloning it would be easier.
By the way, on my machine the blink generates an unexpected pattern. It blinks
on and off at about the expected rate. But, the pattern is flash-flash-skip ;
flash-flash-skip; etc. But, for blinking lights it may not be critical.
Chuck Jones
Automation Technologist
Tate & Lyle
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Dirk Pauwels
Sent: Friday, January 29, 2016 7:52 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] info on ladder logic
Hi Tom,
Thanks for the info and the logic code..
I already experimented a bit with LOGIC and DON and DOFF and came up with
something that works, but I need to "drive" 10 lights, so logic seemed so
"overcomplicated". I was surprised I/A doesn't seem to have a block I can use
to generate a repeating pulse contact. Never needed it before, we tend to use
foxview screens ,PLC's, Schneider displays etc..., this is the first time I use
a "non programmable" control panel.
Thanks & rgds,
Dirk
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