P
Peter Bennett
Guest
On Mon, 18 Oct 2004 06:30:58 GMT, "GaryH" <ghelfert@worldnet.att.net>
wrote:
The question, given in the subject was:
PLC, PIC, PLD, what is the difference between them?
A PLD (Programmable Logic Device) is an integrated circuit consisting
of several AND and OR gates, and maybe flip-flops, which the user can
"program" to connect in various ways. One PLD might replace a small
handful of TTL logic chips.
A PIC is one of a family of microcontrollers made by MicroChip (see
http://www.microchip.com for details)
A PLC is a Programmable Logic Controller is a complete product (made
by several manufacturers) intended to accept inputs from switches (and
sometimes analog sources) and control various devices. These systems
are used as part of industrial control systems, and normally deal with
24 volt input and output signal levels. They are usually programmed
using "ladder logic".
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
wrote:
The question, given in the subject was:
PLC, PIC, PLD, what is the difference between them?
A PLD (Programmable Logic Device) is an integrated circuit consisting
of several AND and OR gates, and maybe flip-flops, which the user can
"program" to connect in various ways. One PLD might replace a small
handful of TTL logic chips.
A PIC is one of a family of microcontrollers made by MicroChip (see
http://www.microchip.com for details)
A PLC is a Programmable Logic Controller is a complete product (made
by several manufacturers) intended to accept inputs from switches (and
sometimes analog sources) and control various devices. These systems
are used as part of industrial control systems, and normally deal with
24 volt input and output signal levels. They are usually programmed
using "ladder logic".
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca