The Allen-Bradley 1775-SR5 A, also cataloged as the 1775-SR5 A Scanner Communications Module, operates as a dedicated hardware component for high-speed serial data transmission and rack-to-rack interface within PLC-3/10 and PLC-5 controller systems.

Hardware Identification & Architecture

• 1775-SR5 A: Standard Scanner Communications Module assigned to high-speed serial I/O communication slots.
• 1775SR5 A: Spare part cross-reference identifier sharing identical electrical board architecture and physical mounting pinouts.

Technical Performance Parameters

Network Determinism & Backplane Integration

The 1775-SR5 A executes deterministic high-speed backplane communication velocity over 1.544 Mbps serial channels. Designed to interface seamlessly with legacy Allen-Bradley architectures, it ensures deterministic I/O density scaling and predictable frame processing across connected remote racks without degrading local CPU scan cycles or firmware flash compatibility.

Package Contents

• 1 x Allen-Bradley 1775-SR5 A Scanner Communications Module
• 1 x Factory Serial Interface Connector Assembly

Physical Installation & Cable Protocols

• Rack Mounting

  Seat the module firmly into the chassis backplane slot until the top and bottom card guides latch completely. Secure retaining screws to maintain proper chassis grounding.

• Communication Cabling

  Use high-quality twinaxial or shielded twisted-pair cables designed for 1.544 Mbps serial operations. Maintain a maximum end-to-end cable run of 5000 ft (1524 m).

• Shielding & Isolation

  Connect cable shields directly to the designated chassis earth ground at one end only to prevent ground loop currents across the 1500 V AC isolation boundary.

Technical FAQ

• What is the maximum serial transmission speed supported by the module?

  The module supports a maximum serial data transfer rate of 1.544 Mbps across standard twinaxial network cabling runs.

• What voltage supply is required to power the internal circuitry?

  The module requires an AC supply of 115 V AC or 230 V AC (+/- 15%) and draws up to 60 W peak power.

• What is the maximum distance for remote network connections?

  The physical layer supports long-distance communication up to 5000 ft (1524 m) without active signal repeaters.

• Is hot-swapping permitted for this unit during backplane operation?

  No, power to the rack chassis must be disconnected prior to inserting or removing the communications module to prevent backplane bus faults.

• What electrical isolation level is provided across system boundaries?

  The internal circuitry provides galvano-static isolation rated at 1500 V AC between communication channels and chassis ground.

• What operating temperature limits must be maintained in the enclosure?

  The ambient operating temperature around the module chassis must remain between 0 deg C and +60 deg C.

• How many communication channels does the module provide?

  The module features four independent high-speed serial I/O channels for multi-drop or point-to-point remote connections.

• What storage conditions are required for spare units?

  Store the module in a non-condensing environment with ambient temperatures between -40 deg C and +85 deg C and 5-95% relative humidity.