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1756-SYNCH

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Allen-Bradley 1756-SYNCH is a ControlLogix SynchLink communication module for synchronized, deterministic fiber-optic communication in distributed motion systems.
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Technical specifications for 1756-SYNCH

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-SYNCH
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix SynchLink Communication Module
  • Stock:
    1
  • Communication Network:
    SynchLink
  • Network Data Rate:
    5 Mbps
  • Optical Wavelength:
    650 nm red
  • Communication Method:
    Synchronous
  • Network Frame Period:
    50 µs
  • Frame Composition:
    3 flags, 3 control bytes, 1 data-status byte, 24 data bytes, and 2 CRC bytes
  • Fiber Ports:
    2
  • Compatible Fiber:
    200/230 µm hard-clad silica
  • Connector System:
    Versalink V-System
  • Fiber Cable Length:
    1 to 300 m
  • Backplane Current at 5.1 V DC:
    1.2 A
  • Backplane Current at 24 V DC:
    3 mA
  • Power Dissipation:
    6.2 W
  • Thermal Dissipation:
    21.2 BTU/h
  • Chassis Slots:
    1
  • Compatible Chassis:
    1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17
  • Enclosure Type:
    Open-style
  • Operating Temperature:
    0 to 60°C
  • Storage Temperature:
    −40 to 85°C
  • Relative Humidity:
    5% to 95%, non-condensing
  • Dimensions:
    3.6 × 13 × 14 cm
  • Weight:
    0.3 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 Topology Synchronization Recovery Application
  • Distributes synchronized timing and reference information across compatible control chassis
  • Supports engineered star, daisy-chain, and ring SynchLink architectures
  • Requires coordinated fiber routing, time-master assignment, firmware, and controller configuration

1756-SYNCH is an Allen-Bradley ControlLogix SynchLink communication module for deterministic fiber-optic synchronization.

It exchanges synchronized time and motion-reference information between compatible chassis and drive systems while the standard control network handles ordinary control communication.

Before replacement, preserve the CST time hierarchy, topology, fiber-port routing, controller project, electronic keying, and firmware record.

Availability, condition, price, and shipping time for 1756-SYNCH are confirmed during quotation.

Allen-Bradley 1756-SYNCH SynchLink Communication Module 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.

  • Preserve the engineered star, daisy-chain, or ring arrangement during replacement
  • Record transmit and receive routing at both fiber ports before disconnecting cables
  • Confirm every node remains in the intended optical path after installation
  • Maintain one approved CST Time Master for the complete SynchLink system
  • Verify each synchronized chassis and drive follows the correct time hierarchy
  • Restore the approved controller and drive configuration before enabling motion
  • Inspect fiber connectors, routing, attenuation, and port status when synchronization is lost
  • Check firmware, electronic keying, chassis power, and controller project references
  • Validate synchronization and coordinated motion under controlled conditions before production
  • Distributed motion systems requiring deterministic time coordination
  • Multi-chassis drive systems exchanging synchronized reference data
  • ControlLogix architectures built around a documented SynchLink time hierarchy
Description
1756-SYNCH is an Allen-Bradley ControlLogix SynchLink communication module for synchronized multi-chassis control applications.

The module uses fiber-optic communication to distribute synchronized time, produced-axis data, drive-reference data, and other time-critical control information between compatible chassis.

Before installation or replacement, confirm the SynchLink topology, master or slave role, compatible fiber media, module series and firmware, chassis power, electronic keying, and saved RSLogix 5000 configuration.
Revisions

Revision Part #

Also known as

1756-SYNCH Ser A
1756-SYNCH/A, Series A, Rev A
Alternative Names
1756-SYNCH 1756 SYNCH 1756SYNCH Allen-Bradley 1756-SYNCH Rockwell Automation 1756-SYNCH ControlLogix 1756-SYNCH 1756-SYNCH SynchLink Module
Technical notes
1756-SYNCH installation or replacement requires checking the ControlLogix chassis, module series, firmware, electronic keying, fiber topology, CST Time Master, and saved project; mismatches can prevent correct synchronization.
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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 1756-SYNCH replace a standard ControlNet or EtherNet/IP communication module?
No. Allen-Bradley 1756-SYNCH broadcasts synchronized reference information and should be used together with a standard control network that handles general control interlocking, programming, and diagnostic communication.
What must be matched when adding or replacing Allen-Bradley 1756-SYNCH in an existing SynchLink system?
Confirm the star, daisy-chain, or ring topology; the module’s time-master or time-slave role; fiber routing and media; hardware series and firmware; electronic keying; and the saved RSLogix 5000 configuration.
Can more than one Allen-Bradley 1756-SYNCH module act as the CST Time Master?
No. The documented system design uses one SynchLink CST Time Master. Other synchronized modules follow the approved time hierarchy.
What optical path should be checked before replacing Allen-Bradley 1756-SYNCH?
Inspect the 200/230 µm hard-clad silica fiber, transmit and receive routing, connector condition, cable length, bend radius, and link attenuation.
Why can Allen-Bradley 1756-SYNCH power up without restoring synchronized motion?
Check the CST master assignment, topology, fiber direction, controller project, drive configuration, module status, electronic keying, and firmware compatibility.
Can Allen-Bradley 1756-SYNCH be moved to another ControlLogix slot without review?
Only after confirming the saved module path, available chassis power, electronic keying, optical routing, and every project reference that depends on the original slot.
What records should be retained before removing Allen-Bradley 1756-SYNCH?
Retain the controller project, module properties, firmware, topology drawing, CST master assignment, fiber-port routing, drive configuration, and current diagnostic state.