Schneider IAP50S handleiding
Handleiding
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Introduction FOUNDATION Fieldbus Communication
Introduction
These pressure transmitters measure pressure by applying the pressure to a
piezoresistive silicon microsensor within the sensor assembly. The microsensor
converts the pressure to a change in resistance, and the resistance change is
converted to a signal that is proportional to the pressure.
• Absolute pressure transmitters measure pressure relative to vacuum. Gauge
pressure transmitters measure pressure relative to ambient air pressure. Both
absolute and gauge transmitters are used in a wide variety of oil, gas, water and
industrial applications.
• Differential pressure transmitters measure the difference between two pressures
applied to opposite sides of the sensor. The output signal is proportional to either
the differential pressure or its square root.
Differential pressure transmitters are often used for measuring fluid flow rates
across a primary device such as an orifice plate, but can also be used for other
types of differential pressure measurements such as liquid level, interface level,
or density measurements.
The FOUNDATION Fieldbus digital measurement signals are transmitted to remote
receivers over the same two wires that supply power to the transmitter electronics.
These wires also carry two-way data signals between the transmitter and remote
communication devices.
The pressure transmitter can be supplied with direct-connect or remote pressure
seals to isolate the measuring element from corrosive or viscous fluids.
The measurement signal is a FOUNDATION Fieldbus digital signal for full
communication with any FOUNDATION Fieldbus host equipped with a FOUNDATION
Fieldbus Interface Module. The communication functionality permits you to
reconfigure a transmitter from a remote Fieldbus host personal computer, or a DCS
equipped with a FOUNDATION Fieldbus Interface Module.
The FOUNDATION Fieldbus is an all-digital, serial, two-way communication system
that runs at 31.25 kbps, interconnecting a Fieldbus host and various field devices
such as process sensors/transmitters, valves/actuators, and controllers — all
connected in parallel to the same bus. Both ends of the bus must be terminated with
standard characteristic impedance networks to minimize reflected signals. Power to
all devices is supplied by a dc Fieldbus power source connected anywhere on the
bus.
NOTE: The power supply must be a FOUNDATION Fieldbus-compatible power
supply.
The communication signals between a Fieldbus host and all other bus-connected
devices, which are superimposed on the dc power signal on the bus, are controlled
according to a strict cycle schedule and protocol. During intervals when control and
measurement signals are not being transmitted according to the schedule, the
devices are free to communicate with each other for such functions as alarms, trend
recording/indicating, etc.
The FOUNDATION Fieldbus uses “Function Blocks” (standardized automation
functions) to implement measurement and control strategies. These blocks may be
distributed throughout the array of devices in whatever manner is most efficient. A
major advantage of the concept is that devices from many manufacturers can be
intermixed in a seamless and integrated manner. Since all devices in a system
connect to the same wire pair, the system requires less wire than comparable
systems, fewer intrinsic safety barriers, and fewer interface cards, resulting in
significant cost savings.
This FOUNDATION Fieldbus system implements the following blocks: Resource
Block, Transducer Block, Analog Input (AI) Blocks, Proportional Integral Derivative
(PID) Block, and Multiple Analog Output (MAO) Block.
• The Resource Block contains the FOUNDATION Fieldbus parameters needed to
define the device description for the transmitter.
MI 020-612 9
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Productinformatie
| Merk | Schneider |
| Model | IAP50S |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 25829 MB |
