Pepperl+Fuchs R2-SP-IC Series Manual page 8

Segment Protector
Product Specifications
Receptacles for the mobile advanced diagnostic module or similar
By default, receptacles for measuring tools such as the mobile advanced diagnostic module
are included. This way, maintenance and commissioning personnel can conduct
measurements in the field without the need for wiring tools and the wiring is never disturbed.
Failure condition handling (short circuit limitation and beyond)
The design of the R2-SP-IC* Segment Protector series focuses on fault tolerance towards
failure conditions on the spur/field device level threatening the entire segment to fail.
Each spur is equipped with short circuit current limitation with unique features:
Spur contact bounce protection: Protects the segment from continuous or intermittent
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current changes due to poorly attached, fractured, or loose fieldbus wires at a spur. When
under vibration, wires can keep connecting and disconnecting to the attached field device
load. The Pepperl+Fuchs spur contact bounce protection protects the fieldbus
communication from permanent disturbances, and safeguards the segment against
failure.
Progressive spur short circuit current limitation: Avoids segment failure in situations where
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the spur current progressively rises, e.g., if water ingresses in the terminal arrangement,
leading to increasing conductivity between the fieldbus wires and causing the current
limiting electronics to dampen the communication signals due to increasing impedance.
The Pepperl+Fuchs Segment Protector safely isolates any affected spur in order to
prevent a total segment failure.
Device jabber protection: Specific software or hardware failures can cause the field
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device to communicate continuously (jabber). The Pepperl+Fuchs Segment Protector has
an integrated device jabber inhibitor that first detects faults caused by device jabber, and
then immediately isolates the faulty device from the segment.
If a spur has a short circuit or failure, the fieldbus trunk and all other field devices remain in
operation. When the fault is repaired, the Segment Protector automatically resumes normal
operation of the spur.
These features, combined with overvoltage protection at 39 V, make segments reliable.
Surge protection for R2-SP-IC* Segment Protectors
Optional pluggable surge protection modules for the trunk and spur cables are available. The
modules are designed to replace the individual connectors at the trunk and the spurs. This way,
surge protection components can be installed in existing cabinets without the need for
additional space or fixings.
Specific versions of surge protectors include a unique diagnostic function for predictive
maintenance of the surge protectors themselves. Predictive failures are communicated through
Pepperl+Fuchs advanced physical layer Infrastructure, enabling the maintenance engineer to
change defective units before they start to adversely influence fieldbus communication. Being
an integral part of the segment, the Pepperl+Fuchs advanced physical layer infrastructure does
not require any scheduled manual maintenance activity.
Fieldbus termination for R2-SP-IC* Segment Protectors
By default, a terminator with a high-availability design is included. A terminator is mounted at
the very end of the segment or trunk. The last Segment Protector on the segment has open
terminals at the T-connector where the terminator is installed. This design increases fieldbus
availability in 2 ways:
1. The connection is secured by screws
2. Overtermination resulting in reduced signal levels is avoided: the termination is clearly vis-
ible for installation personnel and can only be connected at the end of the trunk line
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