Details regarding cable specifications, grounding, termination,
and other network information can be found in IEC 61158
or the wiring installation application guide AG-140 at
www.fieldbus.org
.
1.2
Benefits
The benefits of F
OUNDATION
fieldbus
™
can be found
throughout all phases of an installation:
1.
Design/Installation:
Connecting multiple devices to a single
pair of wires means less wire and fewer I/O equipment.
Initial Engineering costs are also reduced because the
Fieldbus Foundation requires interoperability, defined as
“the ability to operate multiple devices in the same system,
regardless of manufacturer, without a loss of functionality.”
All F
OUNDATION
fieldbus
™
devices must be tested for
interoperability by the Fieldbus Foundation. MAG-
NETROL Enhanced Model 705 3X FF device registration
information can be found at
www.fieldbus.org
.
2.
Operation:
With control now taking place within the
devices in the field, better loop performance and control are
the result. A F
OUNDATION
fieldbus
™
system allows for mul-
tiple variables to be brought back from each device to the
control room for additional trending and reporting.
3.
Maintenance:
The self-diagnostics residing in the smart
field devices minimizes the need to send maintenance
personnel to the field.
1.3
Device Configuration
The function of a F
OUNDATION
fieldbus
™
device is deter-
mined by the arrangement of a system of blocks defined by
the Fieldbus Foundation. The types of blocks used in a typi-
cal User Application are described as follows:
Resource Block
describes the characteristics of the
F
OUNDATION
fieldbus
™
device such as the device name,
manufacturer, and serial number.
Function Blocks
are built into the F
OUNDATION
fieldbus
™
devices as needed to provide the desired control system
behavior. The input and output parameters of function
blocks can be linked over the Fieldbus. There can be
numerous function blocks in a single User Application.
Transducer Blocks
contain information such as calibration
parameters and sensor type. They are used to connect the
sensor to the input function blocks.
5
57-640 Eclipse Guided Wave Radar Transmitter - F
OUNDATION
fieldbus
™
