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AS-Interface is considered
the ideal protocol for networking discrete automated valves
and instruments in the process industries. This easy to
install protocol economically networks up to 62 field
devices onto a single pair of wires that delivers both
signal and power. Interfacing conveniently to most popular
PLCs and DCS systems, it may be used in both general purpose
and hazardous areas with explosion proofing, nonincendive
equipment and nonincendive field wiring protection concepts. |
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DeviceNet may be used with both discrete and analog
applications. It interfaces conveniently into most
Rockwell/Allen Bradley and many other DCS/PLC systems
integrating up to 63 devices on a 4-wire trunk network
carrying power on two wires and communication on the
remaining pair. Used in both general purpose and hazardous
areas with explosion proofing and nonincendive equipment
protection concepts, DeviceNet is suitable for the process
industries as well as factory automation. |
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Foundation Fieldbus has become the de facto standard for
networking analog process instrumentation. Designed for use
in the process industries, Foundation Fieldbus offers
multi-drop capabilities (typically up to 16 devices per
network), long trunk length and compatibility with
intrinsically safe circuits. Featuring an object oriented
block structure for convenient PID loop configuration and
true control in the field, Foundation Fieldbus also promises
to enhance process performance, reduce set-up time and
enable instrument diagnostics. |
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Available
as Profibus DP (Distributed Peripherals) or PA (Process
Automation) this protocol has become well accepted for both
discrete and analog applications. Profibus DP features High
speed data access capable of handling time critical
functions while dramatically cutting wiring and
commissioning costs. PA is recommended for process
applications where intrinsically safe protection concepts
must be used. |
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Traditionally used for integrating I/O back planes into
legacy DCS systems, Modbus may be used to network up to 32
analog or discrete devices on a 4-wire network. Because of
it's universal acceptance, this protocol is recommended
where legacy systems are prevalent and other protocols may
not be readily adapted. |
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