Ground Reference Switch; Configuration; Standard; F809F Configuration - Eaton CROUSE-HINDS Series Instruction Manual

2 .4 .3 Fieldbus segment design rules
A segment may support a number of F809F modules. The
actual number is based on a number of factors:
the logical device limit of the host,

the fieldbus power supply capacity,

operational constraints such as bandwidth

the overall impact on the system if that diagnostic

segment should be lost.
Shielded, twisted-pair cable, complying with FOUNDATION
FIELDBUS 'Type A' construction is recommended for the
diagnostic segment. Unshielded instrument cable is suitable
for interconnections between adjacent carriers.
2 .4 .4 Diagnostics module power supply
The diagnostic segment must be powered by a conditioned
fieldbus power supply (see Figure 2-4 & 2-5) that will provide
a voltage in the range 9–32V DC at each F809F fieldbus
diagnostic module. This power supply may be either simplex
or redundant, depending on the application, and be capable
of providing sufficient current for the entire diagnostic
segment.
Each F809F module draws approximately 15mA, so a
segment comprising 10 modules, for example, will require an
output current of at least 150mA. Suitable redundant fieldbus
power supplies could be MTL-Relcom type F800 or FPS-I,
either of which can provide 350mA at 21.5V to 28V DC
depending on model. Alternatively, type FPS-DT will provide
enough for two segments of non-redundant power.
2 .4 .5 Diagnostics module segment
termination
As with all Fieldbus segments, the one used for the diagnostic
data must be terminated at both ends to maintain the
bus impedance within F
oundation
interconnections are via the carrier, a terminator must
be connected between the H1+ and H1- terminals of the
diagnostic bus connector at the far end of the segment (see
Figure 2-4). Suitable terminators for this are MTL type FBT1-IS
or F100.
When interconnection is via the top connector, the
recommended method is to use a Megablock with a built-in
terminator to interconnect the fieldbus spurs and terminate the
bus (see Figure 2-5). Termination of the bus at the host end
may be provided either by an integrated terminator within
the power supply (such as exists within the FPS-I, FPS-DT and
F800 types) or by means of a separate terminator.
INM F809F-2C rev 2
fieldbus TM limits. When
4 4
2 .5

Ground Reference Switch

The ground reference switch is normally used in position '1'
- see Figure 2-7. For use with the F618D carrier refer to the
instruction manual INMF618D (Revision 2 or later).
Figure 2-7:
Ground
reference switch
set to '1'
A separate case ground terminal is provided (Figure 2-8)
to enable the case of the module to be linked to a ground
terminal on the circuit board.
Figure 2-8:
Case ground
terminal
3

CONFIGURATION

3 .1

Standard

Each F fieldbus
oundation
system has a different way of displaying and performing
configurations. Some will use Device Descriptions (DDs) and
DD Methods to make configuration and displaying of data
consistent across host platforms.
Refer to the fieldbus control system's documentation to
perform configuration changes using a Foundation fieldbus
host or configuration tool.
The function of the F809F is to provide diagnostic data,
therefore configuration changes can be made with the
MODE_BLK.ACTUAL in AUTO or Out Of Service (OOS)
mode.
NOTE: Fieldbus devices used in process applications usually
have to be set to OOS mode before making configuration
changes.
3 .2

F809F Configuration

The F809F is available with the standard configuration
setting. The configuration settings and block configuration
may be changed in the field with the F
or a configuration tool.
TM configuration tool or host
fieldbus host
oundation