I don't have access to an FBM to try it, but I think this should work in
ladder:
--|/|-------(TOF)-- t1
--|/|-------(TOF)-- t2
Where the 1st contact is tied to the 2nd TOF, the 2nd contact is tied to
the 1st TOF.
When the FBM initializes, the first contact is closed and TOF is on for for
t1 secs; this forces the second contact to open, thereby stopping its TOF.
When the 1st TOF times out, the second contact closes, starting its TOF
timer for t2 secs, thereby stopping the TON timer.
I believe this will result in a t1 on /t2 off blink, which could be tied to
a CO.
Since there are 16 timers available in ladder logic, you could drive 8
outputs.
The document you want is B0193AW Integrated Control Software Concepts.
On Fri, Jan 29, 2016 at 11:07 AM, gheyIl . <breandan789@xxxxxxxxx> wrote:
Rather than being limited to 8 Boolean outputs, consider using LO01 (long
integer output) which has 32 bits, each of which can be written with OUT
Oxx. This LO01 can then be connected to a MCOUT to drive all your FBM
outputs.
On Fri, Jan 29, 2016 at 10:45 AM, Jones, Charles R. (Chuck) <
Chuck.Jones@xxxxxxxxxxxxxxx> wrote:
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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