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I'm looking for a really high speed digital output card (DO)

Created by: Import-User-1 at: 9/15/2010 10:23 AM (4 Replies)

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9/15/2010 10:23 AM	Rate (0)
Import-User-1 Posts: 3609 Rating: (29)	Import of a Technical Question of an User buru wrote: Dear All, I'm looking for a really high speed digital output card(DO). In fact I'm wondering if there is such a DO card to be able to react in 10-15 ms and to support 1 amper (A). The only DO cards I'm familiar with is the one with output on relay (but the relay switching time is bigger than 15 ms) and the one with output on transistor but for this one the maximum current is 0.5 amper (A). Can you recommend me a DO card with requested specifications??? With best regards, buru
Import-User-1 Posts: 3609 Rating: (29)
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9/15/2010 1:10 PM	Rate (0)
Mike J Platinum Member Joined: 10/9/2007 Last visit: 1/13/2025 Posts: 1253 Rating: (115)	Hi If you don't receive answers from the colleagues hereor don't find a suitable card, one solution is to use fast auxiliary relays. So the current for your output card doesn't need to be high and the delay- considering DO and auxiliary device - will reach your requirements. This is normal in several projects. Another advantage is that the possibility of damaging your card by surge, short circuits and so on is minimized, as only the contacts from the auxiliary device are exposed to such risks. And depending on the auxiliary relay, changing it is easier than an IO card. Mike J
	Energy Automation products: Sicam, Siprotec, Digsi
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9/15/2010 2:09 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 1/15/2025 Posts: 12328 Rating: (2699)	Hello buru; Mike J has a good point, you will have a choice between high current poutput and speed, for most modules. For example, Siemens has a very high-speed boolean processor, which can be used either as part of a S7 system, or as a stand-alone unit, and it can give you pulse outputs lasting between 1 and 50 us (microseconds), programmable. But max. output current is 0,5 A per output; this is where a relay, high-speed of course, could help you out. The module is the FM 352-5, and you have the manual here: http://support.automation.siemens.com/WW/view/en/9240171/0/en You have to understand also that with "normal" output cards the switching frequency of the output module will vary depending on the type of loadd; with a inductive load, the DO module 6ES7322-1BF01-0AA0 for exampleshows a frequency of0.5 Hz, while when connected to an resistiveload the switching frequency goes up to 100 Hz, closer to what you need. You can look at all specifications for output modules in the S7-300 module data manual: http://support.automation.siemens.com/WW/view/en/8859629 Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 9/15/2010 4:56 PM
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9/15/2010 6:32 PM	Rate (0)
bit7 Experienced Member Joined: 7/26/2008 Last visit: 1/15/2025 Posts: 100 Rating: (19)	Hi User, I would suggest you look at the combination of a high speed transistor output card and a solid state relay. The correct solid state relay should give you the higher current without sacrifising speed. To ensure 10 ms aim for reaction times of 1 or 2 ms.

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10/19/2010 10:58 AM	Rate (1)
fletch Regular Member Joined: 5/10/2007 Last visit: 7/30/2024 Posts: 1 Rating: (1)	For this purpose I would use the FM352 boolean processor and an external solid state relay just as dchartier and bit7 indicate. I use this combination to control a high speed valve for lube injection in drilling systems and its worked well for a few years.

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This contribution was helpful to 2 thankful Users miami dchartier

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