5 second reset?
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From: jodleren on 12 May 2010 12:18 Hi all I need to hold Reset on a PLC for some time. To do so I'd like to use a crystal and chip, not a condensator or something. I looked at the 4060, which has an onboard option for a crystal, but I am a little uncertain about how the counter works - I need to divide by at least 160000 (or, say 2 in power of 17 or 18 is just fine for me). Is there a single chip available that can do most of it? Present power is either 5 or 12V. Sonnich
From: Sjouke Burry on 12 May 2010 12:47 jodleren wrote: > Hi all > > I need to hold Reset on a PLC for some time. > To do so I'd like to use a crystal and chip, not a condensator or > something. > > I looked at the 4060, which has an onboard option for a crystal, but I > am a little uncertain about how the counter works - I need to divide > by at least 160000 (or, say 2 in power of 17 or 18 is just fine for > me). > > Is there a single chip available that can do most of it? > > Present power is either 5 or 12V. > > Sonnich 555 oneshot
From: mpm on 12 May 2010 14:15 On May 12, 11:18 am, jodleren <sonn...(a)hot.ee> wrote: > Hi all > > I need to hold Reset on a PLC for some time. > To do so I'd like to use a crystal and chip, not a condensator or > something. > > I looked at the 4060, which has an onboard option for a crystal, but I > am a little uncertain about how the counter works - I need to divide > by at least 160000 (or, say 2 in power of 17 or 18 is just fine for > me). > > Is there a single chip available that can do most of it? > > Present power is either 5 or 12V. > > Sonnich A time delay relay would also work, but they are not inexpensive. Might be overkill for your application, but ready off-the-shelf. Many are DIN-rail mountable, etc.. Search Digikey for Relay, time-delay
From: ian field on 12 May 2010 16:24 "mpm" <mpmillard(a)aol.com> wrote in message news:b72ff7ec-2e6b-448d-8c1d-650c3b03a27e(a)d39g2000yqa.googlegroups.com... On May 12, 11:18 am, jodleren <sonn...(a)hot.ee> wrote: > Hi all > > I need to hold Reset on a PLC for some time. > To do so I'd like to use a crystal and chip, not a condensator or > something. > > I looked at the 4060, which has an onboard option for a crystal, but I > am a little uncertain about how the counter works - I need to divide > by at least 160000 (or, say 2 in power of 17 or 18 is just fine for > me). > > Is there a single chip available that can do most of it? > > Present power is either 5 or 12V. > > Sonnich A time delay relay would also work, but they are not inexpensive. Might be overkill for your application, but ready off-the-shelf. Many are DIN-rail mountable, etc.. Search Digikey for Relay, time-delay Might suffer contact bounce - an electronic solution would be better.
From: George Herold on 13 May 2010 00:00
On May 12, 12:18 pm, jodleren <sonn...(a)hot.ee> wrote: > Hi all > > I need to hold Reset on a PLC for some time. > To do so I'd like to use a crystal and chip, not a condensator or > something. > > I looked at the 4060, which has an onboard option for a crystal, but I > am a little uncertain about how the counter works - I need to divide > by at least 160000 (or, say 2 in power of 17 or 18 is just fine for > me). > > Is there a single chip available that can do most of it? > > Present power is either 5 or 12V. > > Sonnich Seems like someone must sell a clock chip/package that puts out one pulse per second? Then you just have to count to 300. 'course I don't know of any such device. George H. |