PSS 21H-1B2 B3
Page 3
• Twinaxial (Dual-Conductor Coaxial) Fieldbus
Extension (
Figure 2) - Using twinaxial cable, the
Fieldbus can optionally extend outside of the
enclosure and can be up to 1800 m (6,000 ft) in
length. Up to 64 Fieldbus Modules (excluding
expansion modules) attach to the extended bus
through Fieldbus Isolators. (Up to 24 Fieldbus
Modules, excluding expansion modules, can
connect to each isolator.) The twinaxial Fieldbus
extension may be redundant.
• Fiber Optic Fieldbus Extension (Figure 3) - The
fiber optic Fieldbus can optionally extend the
distance as well as add application versatility and
security. Overall Fieldbus length can be up to
20
km (12.4 mi). Like the twinaxial Fieldbus
configuration, the fiber optic Fieldbus
configuration supports up to 64 Fieldbus Modules
(excluding expansion modules), up to 24
modules per isolator.
Figure 2. Twinaxial Fieldbus Extension (Typical Configuration)
Figure 3. Fiber Optic Fieldbus Extension (Typical Configuration)
FIELDBUS
ISOLATOR
REDUNDANT FIELDBUS
*OPTIONALLY FAULT-TOLERANT
FIELDBUS
MODULE
FIELDBUS
MODULE
FIELDBUS
MODULE
FIELDBUS
EXPANSION
MODULE
CONTROL
PROCESSOR 30*
ENCLOSURE A
ENCLOSURE B
FIELDBUS
ISOLATOR
REDUNDANT FIELDBUS
FIELDBUS
MODULE
FIELDBUS
MODULE
FIELDBUS
MODULE
FIELDBUS
EXPANSION
MODULE
ENCLOSURE C
TERMINATION
EXTENDED FIELDBUS
(OPTIONALLY REDUNDANT)
CONTROL
PROCESSOR 30*
ENCLOSURE A
ENCLOSURE B
FIBER OPTIC CABLING**
*OPTIONALLY FAULT-
TOLERANT
** OPTIONALLY
REDUNDANT
1. THE MID BUS MODEMS ARE USED WHEN THE CONFIGURATION ENCOMPASSES MORE THAN TWO ENCLOSURES.
THEY MAY ALSO BE USED AS REPEATERS, WHERE ADDED FIBER OPTIC CABLING DISTANCE IS REQUIRED.
2. CONNECTION OF THE FIBER ISOLATORS TO THE FIELDBUS MODULES (FBMs) IS SIMILAR TO THAT SHOWN IN FIGURE 2.
3. ANY TWINAXIAL FIELDBUS SEGMENT CAN BE EXTENDED TO SERVICE FBMs IN ANOTHER ENCLOSURE. (TWINAXIAL
CABLING BETWEEN ENCLOSURES IS SHOWN IN FIGURE 2.)
NOTES:
MID BUS
MODEM**
(NOTE 1)
FIELDBUS
ISOLATOR
TO
FIELDBUS
MODULES
(NOTE 2)
ENCLOSURE C
MID BUS
MODEM**
(NOTE 1)
FIELDBUS
ISOLATOR
TO
FIELDBUS
MODULES
(NOTE 2)
ENCLOSURE D
END BUS
MODEM**
FIELDBUS
ISOLATOR
TO
FIELDBUS
MODULES
(NOTE 2)
END BUS
MODEM**
TWINAXIAL
FIELDBUS
SEGMENTS**
(NOTE 3)
(7 paginas)
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