Something else to think about ... could the individual outputs of MCOUT be
used to invert themselves?
Not having access to a system to try it out right now, I envision:
1. the light command is connected to MCOUT.IN_x
2. the MCOUT.PAKCRB is connected to MCIN.INPUTS (feedback for blinking)
3. the MCIN.CINMSK is used to determine which points should blink
4. the MCIN.PAKCIN is connected to MCOUT.INVOPT
5. adjust the PERIOD/PHASE of the MCIN/MCOUT to set the blink frequency
There may be some additional tweaking to make this work, but it should
allow 32 lights with just 2 blocks.
On Tue, Feb 2, 2016 at 6:05 AM, Dirk Pauwels <dirk.pauwels@xxxxxxxxxx>
wrote:
Hi Alex,
Just to let you know the PTC block works. It still requires a little more
tuning (Pband, GAP etc) to get the OUTINC to pulse more or less in a stable
rhythm, but that's not an issue for the moment. I would never have thought
of using it for this purpose if you hadn't suggested it.
I did it like you suggested, using the MA tied to the GDEV's MMAIND to
activate it.
I then used the PLB block we use to drive the lights and included the
OUTINC as a non contact -|/|- and this setup generates a blinking light
when the GDEV is in MMAIND and a steady/sustained(?) light when the MMAIND
is 0, no light when the pump is stopped.
So that certainly is a valid solution.
Only disadvantage is that I need 1 PTC per light. For 10 lights not a
real issue, but I think I'll go for the logic code as suggested, then I
only need 2 Calc blocks.
Thanks to all & Rgds,
Dirk
-----Oorspronkelijk bericht-----
Van: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
Namens Johnson, Alex
Verzonden: vrijdag 29 januari 2016 17:05
Aan: foxboro@xxxxxxxxxxxxx
Onderwerp: Re: [foxboro] info on ladder logic
Dirk,
Re: I was surprised I/A doesn't seem to have a block I can use to generate
a repeating pulse contact.
Actually, there is one, the PTC block.
I generated a string of pulses on either of two outputs. The choice of
output is based on the sign of the difference between its MEAS and SPT. The
duration of the pulse is based on the amount of the difference.
It seems to me that you could get what you want with one of these. Set the
MEAS to 0, the SPT to >0, and turn it on and off with the MA bit.
Please note, I've never, ever seen one of these put to use, but it looks
like a simple way to do what you want.
Best,
Alex
_____________________________________________________________________________________
Alex Johnson | Schneider Electric | Invensys | United States | System
Architect, Next Generation Systems
Phone: +1 713 329 8472 | Fax: +1 713 329 1700
Email: alexander.johnson@xxxxxxxxxxxxxxxxxxxxxx | Site:
www.schneider-electric.com | Address: 10900 Equity Drive, 77041 Houston,
TX, United States
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