Fieldbus Foundation and Profibus PA
versions of the BA484DF and BA488CF are available and have been registered by
both organisations. The Fieldbus Foundation version now has selectable function
blocks allowing use with
most popular system hosts. Configuration files may be downloaded using the links
Powered by the fieldbus
the BA484DF and BA488CF only require a 2-wire connection, no additional power
supply Zener barriers or galvanic isolators are required. The high contrast 86 x
45mm liquid crystal display incorporates a green backlight enabling the display
to be read in all lighting conditions from full sunlight to total darkness.
results from the use of standard display formats. Apart from loading the
BA484DF/BA488CF configuration files onto the system host and selecting the
fieldbus variables to be displayed, no programming is required. Configuration of
the Fieldbus Displays is performed via the fieldbus and the instrument front
panel push buttons.
ATEX, FM and IECEx intrinsic safety certification
allows the displays to be installed in gas and dust hazardous areas. The two
fieldbus terminals comply with the Fieldbus Intrinsic Safety Concept (FISCO)
simplifying system design and documentation, although connection to non-FISCO
intrinsically safe systems is possible using the entity concept. This allows a
BA484DF or a BA488CF display to be directly connected to almost any hazardous
fieldbus segment, provided that the segment can supply the 25mA consumed by the
Six optional alarm outputs
may be linked to any of the displayed variables. Each isolated single pole solid
state output may be conditioned as a combined high and low alarm, or as just a
high or low alarm. All the outputs comply with the requirements for simple
apparatus, which permits them to switch any certified intrinsically safe load
such as an intrinsically safe sounder, lamp or solenoid valve.
Custom display screens
dedicated to a specific application can be created by writing to the transducer
block parameters. Custom designed display screens can contain text in five
different font sizes plus lines, boxes, bargraphs, simple graphics and fieldbus
process variables. Free programming utilities to assist with screen development
are available via the links below.
The four push buttons (six in the case of the BA488CF) on
the front of the instrument may be used for returning operator acknowledgments
or controls by reading a transducer block parameter. If larger industrial
switches are required for these acknowledgements, up to six external push
buttons may be connected to either display. When the external switches are
activated, the front panel push buttons may be disabled or operated in parallel
with the external switches.
includes Fieldbus Foundation and Profibus Interface Guides and a Programming
Guide that explains how to create custom display screens. See links below.
the BA484DF is moulded in glass reinforced polyester (GRP), has stainless
steel fittings, silicone gaskets and an armoured glass window. Its robust
construction provides IP66 protection. A separate terminal compartment allows
the BA484DF to be installed and terminated without exposing the display
electronics. The front panel of
the BA488CF has IP66 protection and a neoprene gasket seals the joint
between the text display and the panel, making it suitable for use in areas that
will be hosed.