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E-mail: [email protected] Web site: www.mtl-inst.com
Dec 2007
Fieldbus diagnostic monitor
FBT-6
assesses network health
connects to intrinsically safe
fieldbus in Zone 1 and
Division 1 hazardous areas
connects to non-incendive
fieldbus in Zone 2 and
Division 2 hazardous areas
uploads measurement data to
a PC via USB port
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fieldbus powered
device add & drop indication
shield short indication
measures low, fieldbus and
high frequency average and
peak noise
measures signal level for all
segment devices
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The Fieldbus diagnostic monitor, FBT-6,
is
used to examine the operation of a live F
OUNDATION
fieldbus™
H1 network without interfering with its
operation. The Monitor is intended for maintenance
personnel to verify network operation or to
troubleshoot an errant network.
The FBT-6 diagnostic monitor
checks for
retransmissions from each device on the segment,
providing a key performance indicator of the
networks health. Measurements of bus voltage level,
device signal level, and peak and average noise
level. It displays the number of devices present on
the segment and indicates when devices are added
or removed from the network. It also detects the
presence of a short between either of the signal wires
and the cable shield.
Modern fieldbus commissioning procedures
require various bus parameters to be measured
and recorded. Key parameters include bus voltage,
signal level for each device and noise level on each
segment or at every device on each segment and
recording the results allows a baseline of the fieldbus
physical layer to be established. The FBT-6 collects
this data, and allows up to eight file sets of data to
be saved for uploading to a PC via a USB port. The
data is uploaded as a tab-delimited text file and may
then be used to create comprehensive commissioning
and operations reports. Considerable savings can
be achieved by reducing commissioning time and
verifying the accuracy of the data on the segment.
Data collected from periodic network
verification testing or during troubleshooting can be
simply transferred to a file for easy comparison to the
segment baseline/history measurements. Data can
be displayed as tables and graphs using commonly
available software such as Microsoft® Excel.
Hand-held for portability
, the FBT-6 is powered
by the fieldbus so that no batteries or external power
source is required. It includes colour- coded test leads
and an LCD display.
Relcom
