+24 i/o
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I am using PLC I/O that is normally +24 volts and grounds to trigger
the stamp. What is the best way to wire this I/O to the stamp?
Thanks,
Todd
the stamp. What is the best way to wire this I/O to the stamp?
Thanks,
Todd
Comments
environment you're using all this stuff in. A simple way is a two-resistor
voltage divider. I'll attempt this with text:
( PLC output )
[noparse][[/noparse] 22K resistor ]
[noparse][[/noparse] Stamp input ]
[noparse][[/noparse] 4.7K resistor
]
( Ground )
With these values, an output of 24 vdc from your PLC will be dropped down to
about 4.2 vdc to the Stamp. Keep in mind that this provides NO electrical
isolation between the PLC and the Stamp. If your PLC takes a hike, the Stamp
will probably go with it.
-- Jon Williams
-- Applications Engineer, Parallax
In a message dated 8/7/01 10:49:43 AM Central Daylight Time,
todd_goetze@y... writes:
> I am using PLC I/O that is normally +24 volts and grounds to trigger
>
[noparse][[/noparse]Non-text portions of this message have been removed]
sinking the 24 V...
Which is it?
Aaron
On Tue, 07 Aug 2001 15:46:56 -0000 "Todd Goetze" <todd_goetze@y...>
writes:
> I am using PLC I/O that is normally +24 volts and grounds to trigger
> the stamp. What is the best way to wire this I/O to the stamp?
>
> Thanks,
> Todd
>
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stamps I/O pins directly to a plc, but a much better way to do this
would be to write a program that would communicate from the stamp to
the plc. This would save your I/O for more options later on. If you
want to just turn on outputs on the stamp then you could simply use
and ascii out from the plc to the stamp. Unless there is also an
ascii in box.
What type of plc are you using? Most manufactures of plc's will sell
or give you the comm box for writing programs with there comm
protocol. I have wrote such a thing for the direct-logic plc from
automation direct in directnet protocol and have a board that will
display a message from what resides in a plc's register. And It also
sends the temp back to the plc to store in anouther register, that
you can use the ><= do somthing if the temp in the cabnit is at the
correct temp. I also have the protocol for df1 from Allen Bradley but
not had the time to program the protocol for the stamp.
If you are interested in a FREE board, yes thats right a Free board
let me know and I will have it shipped to you. With example programs
for plc direct plc's. I had three of these boards made and really
only needed one.
It has three chips that can service the bs2 also, a eeprom, a ds1302,
and a ds temp sensor. You can also connect a 2x16 serial lcd and 4
5vdc relays to it.
It is worth considering at least.
--- In basicstamps@y..., "Todd Goetze" <todd_goetze@y...> wrote:
> I am using PLC I/O that is normally +24 volts and grounds to
trigger
> the stamp. What is the best way to wire this I/O to the stamp?
>
> Thanks,
> Todd
optically isolated I/O modules. Go to www.opto22.com and check out
their G1 or G4 standard digital DC input modules. These modules will
accept up to 24VDC logic and give you a nice 5V input to your stamp.
They are also optically isolated so your stamp is protected from the
higher voltage.
I think these are a little pricey...Maybe up to $10 or so per module
depending on which module you buy so if you require many you may want
to use a simpler device or build your own.
--- In basicstamps@y..., "Todd Goetze" <todd_goetze@y...> wrote:
> I am using PLC I/O that is normally +24 volts and grounds to trigger
> the stamp. What is the best way to wire this I/O to the stamp?
>
> Thanks,
> Todd