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1757-FFLD2

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Allen-Bradley 1757-FFLD2 is a ProcessLogix FOUNDATION Fieldbus linking device that connects an Ethernet host network to two H1 fieldbus segments.
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Technical specifications for 1757-FFLD2

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1757-FFLD2
  • Product Family:
    ControlLogix
  • Product Type:
    ProcessLogix FOUNDATION Fieldbus Linking Device
  • Stock:
    1
  • Network Role:
    FOUNDATION Fieldbus linking device
  • Host-Side Communication:
    FOUNDATION Fieldbus HSE or EtherNet/IP
  • H1 Segments:
    2
  • H1 Data Rate:
    31.25 kbps
  • Maximum Devices per H1 Segment:
    16
  • Typical Recommended Devices per H1 Segment:
    8 to 10
  • Maximum Devices per 1757-FFLD2:
    32
  • Input Current:
    300 mA at 24 V DC ±20%
  • Inrush Current:
    1.5 A
  • Fieldbus-to-Backplane Isolation:
    50 V continuous; tested at 500 V AC for 60 seconds
  • Ethernet-to-Backplane Isolation:
    50 V continuous; tested at 500 V AC for 60 seconds
  • Ethernet Interface:
    RJ45 using Category 5e or higher cable
  • Fieldbus Wiring:
    Shielded twisted-pair copper, 18 AWG
  • Terminal Torque:
    0.34 N·m
  • Panel-Mounting Screw Torque:
    1.1 to 1.8 N·m
  • Program Retention without Power:
    21 days
  • Internal Battery:
    Non-replaceable
  • Battery Design Life:
    5,000 charge/discharge cycles or 13 years
  • Enclosure Type:
    Open-style
  • Operating Temperature:
    0 to 60°C
  • Nonoperating Temperature:
    −40 to 85°C
  • Relative Humidity:
    5% to 95%, non-condensing
  • Vibration:
    5 g at 10 to 500 Hz
  • Operating Shock:
    15 g
  • Nonoperating Shock:
    30 g
  • Dimensions:
    16.8 × 13.8 × 8.7 cm
  • Weight:
    0.74 kg
  • Tariff Code:
    8517623990
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Network Fit Safety & Installation Recovery Application
  • Connects a supported Ethernet host environment to two FOUNDATION Fieldbus H1 segments
  • Maintains the network configuration and schedules required for field-device communication
  • Requires engineered segment power, conditioning, termination, grounding, and enclosure protection

1757-FFLD2 is an Allen-Bradley ProcessLogix FOUNDATION Fieldbus Linking Device for two H1 fieldbus segments.

It bridges a supported host network to the H1 device networks and coordinates the applicable fieldbus configuration and communication schedules.

Before replacement, preserve the approved network backup and verify Ethernet settings, both H1 segment designs, terminal assembly, enclosure, grounding, and connected devices.

Availability, condition, price, and shipping time for 1757-FFLD2 are confirmed during quotation.

Allen-Bradley 1757-FFLD2 Fieldbus Linking Device Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Select the two-segment version only when the approved architecture requires two H1 links
  • Verify host compatibility, saved schedules, device descriptions, and network addressing
  • Engineer each H1 segment according to connected devices and process-control requirements
  • Mount the 1757-FFLD2 on the approved DIN rail or panel and maintain the installation clearances specified by Rockwell Automation.
  • Before Class I Division 2 use, inspect units shipped from January 2004 through May 2008: H1 terminal blocks without retaining screws are covered by Rockwell Automation’s mandatory safety alert and must be returned for correction.
  • After corrective service, confirm the approved firmware revision and redownload the saved fieldbus configuration before recommissioning the 1757-FFLD2.
  • Maintain an external backup of Ethernet settings, H1 configuration, and device schedules
  • Verify both segment power systems and expected field devices after restoration
  • Review linking-device and port diagnostics before returning control to the process
  • ProcessLogix systems linking host controllers to FOUNDATION Fieldbus instruments
  • Two-segment H1 networks serving distributed process measurement and final-control devices
  • Industrial fieldbus architectures requiring centralized Ethernet-to-H1 communication
Description
1757-FFLD2 is an Allen-Bradley FOUNDATION Fieldbus linking device that connects an Ethernet network to two H1 fieldbus segments.

The device bridges host communication to the H1 networks, maintains the applicable network configuration and schedules, and supports fieldbus device communication through its two independent H1 ports.

Before installation or replacement, confirm the required number of H1 segments, Ethernet addressing, fieldbus power and conditioning, segment terminators, enclosure, grounding, mounting clearance, and saved network configuration.
Revisions

Revision Part #

Also known as

1757-FFLD2 Ser A
1757-FFLD2/A, Series A, Rev A
Alternative Names
1757-FFLD2 1757 FFLD2 1757FFLD2 Allen-Bradley 1757-FFLD2 Rockwell Automation 1757-FFLD2 ProcessLogix 1757-FFLD2 1757-FFLD2 Fieldbus Linking Device
Technical notes
Restore the approved Ethernet and H1 configuration, then verify segment power, conditioners, terminators, grounding, devices, schedules, and terminal assembly before returning 1757-FFLD2 to service.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can Allen-Bradley 1757-FFLD2 operate without a compatible host network?
No. Allen-Bradley 1757-FFLD2 links a supported HSE or EtherNet/IP host environment to H1 networks and must be commissioned as part of the complete control-system architecture.
Should Allen-Bradley 1757-FFLD2 be selected when the project requires more than two H1 segments?
No. Allen-Bradley 1757-FFLD2 provides two H1 segments. If four segments are required, review the officially documented 1757-FFLD4 and confirm system, firmware, network, and enclosure compatibility before selection.
Does Allen-Bradley 1757-FFLD2 replace the fieldbus segment power conditioner and terminators?
No. The complete H1 installation must still provide the correctly rated segment power, power conditioning, terminators, cable, shielding, and grounding required by the FOUNDATION Fieldbus design.
Can Allen-Bradley 1757-FFLD2 be mounted on either a DIN rail or a panel?
Yes. The official instructions support DIN-rail and panel mounting. Preserve the specified ventilation clearance, grounding method, mounting hardware, and enclosure protection for the installation environment.
What must be verified before connecting Allen-Bradley 1757-FFLD2 to an existing Ethernet and H1 network?
Verify the IP configuration, saved H1 schedules, segment power and conditioning, terminator placement, device addresses, cable shielding, grounding, and the supported host configuration.
Is the internal battery in Allen-Bradley 1757-FFLD2 a field-replaceable service item?
No. Rockwell Automation documents a non-replaceable internal battery. Maintain an approved configuration backup rather than relying on battery retention as the only recovery method.
How should a replacement Allen-Bradley 1757-FFLD2 be prepared before the fieldbus system returns to service?
Restore the approved Ethernet settings and H1 configuration, verify both segment power systems, confirm that expected field devices appear on each link, and check linking-device and port status before resuming control.