1
INM F892 Rev 1
MTL F892 - 8 Segment Redundant Fieldbus Power Supply for use with the
non-proprietary cabled systems
Figure 1
- F892-PS
1
OVERVIEW
The F892 redundant fieldbus power supply is designed to provide redundant power
for eight (8) Foundation fieldbus
TM
H1 segments. Pluggable connectors are provided
on the F892-CA module carrier for connection to the eight segments. Fixed screw
terminals are used for the 8 Host segment connections. Power for the eight fieldbus
segments is provided by two F801 or F802 Power Modules mounted to the carrier
and operating in a redundant configuration. Failure alarms, galvanic isolation, power
conditioning and segment termination are incorporated into each Power Module. A
single F801 or F802 module may be used where redundancy is not required.
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DESCRIPTION
For maximum reliability, the module carrier contains no components and only provides
interconnections between the power modules and the external connections. The
carrier circuit board is supported in a rigid metal frame that protects it from mechanical
damage. Secure DIN-rail mounting is provided by integrated retaining screws. The
Power Module provides galvanic isolation between the 24V DC input power and the
fieldbus segments, as required by the IEC61158-2 fieldbus standard and the Fieldbus
Foundation
TM
FF-831 validation test for fieldbus power supplies. There is also galvanic
isolation between the fieldbus segments, thereby preventing cross-talk between
segments in the event of ground faults in the field wiring. Each segment has its own
