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notsosure
Joined: 24 Jul 2003
Posts: 1
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 24 Jul 2003 22:32 120 VAC digital input? |
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| Is there a stand alone digital input board accepting 120vac inputs?
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 24 Jul 2003 22:38 reduce input |
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| for safety reasons, you should not connect any circuit directly to the power line. Use a step down transformer to both provide safety isolation and reduced voltage.
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sklux
Joined: 30 Jan 2002
Posts: 58
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| 27 Jul 2003 23:49 |
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I know that digital input cards of plc's often does support that voltage but
I suppose you are looking for something connected on a PC
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House_Cat
Joined: 21 Feb 2002
Posts: 1349
Helped: 274
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| 28 Jul 2003 0:03 |
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Take a look at the link below:
(replace * with t below)
h**p://www.adac.com/catpages/5608aci.html
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ASIC
Joined: 18 May 2001
Posts: 220
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| 03 Aug 2003 10:37 |
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There are special I/O modules available for this purpose. Check Potter & Brumfield website
http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=15155&M=FEAT&P=&LG=1&I=41&G=G&LBOX=78077
ASIC
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goodboy_pl
Joined: 12 Mar 2002
Posts: 243
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| 26 Aug 2003 18:15 |
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If u want to measure mains voltage/current the best solution is to use isolators like CT(current transformer) and PT(voltage transformer), for low current/low voltage and precise measurment also there is another option: linear opto coupler like IL300 from www.infineon.com with a bandwidth of 100KHz, for lower bandwidth (10KHz) u can use isolated opamps which use pwm tecknique and transformer to transfer sampled voltage amplitude throgh trandformer.
If u want to control (switch) mains voltage use pulse transformer and triac or opto triacs.
BEST!
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