The Allen-Bradley 1785-L80E, also cataloged as the 1785-L80E EtherNet/IP PLC-5/80E Controller, operates as a dedicated hardware component for deterministic industrial network polling and logic execution within Allen-Bradley PLC-5 control systems.

Model Catalog & Identification

• Product Family: PLC5
• Product Model: 1785-L80E
• Spare Model: 1785L80E
• Series Name: PLC-5/80E
• Country of Origin: USA
• Place of Shipment: Xiamen, China

Hardware Specifications

Deterministic Network & Bus Architecture

Configured for high-speed industrial automation platforms, the controller manages deterministic network communication via integrated EtherNet/IP and Data Highway Plus (DH+) layers. Backplane bus communication velocity and firmware flash compatibility rely on stable 3.3A backplane power distribution. I/O density scaling supports up to 93 physical racks with individual scan intervals governed by active link baud rates.

Ordering Information

• 1 x 1785-L80E EtherNet/IP PLC-5/80E Controller module
• 1 x 1770-XYC lithium battery unit
• 1 x Factory compliance and technical documentation sheet

Field Installation Guidelines

• Chassis Mounting Protocols:
  • Secure the module firmly into designated slots on the compatible PLC-5 chassis backplane.
  • Ensure mechanical locking latches engage fully to maintain structural stability against vibration.
• Power & Grounding Execution:
  • Verify backplane power distribution does not exceed rated current limits prior to insertion.
  • Connect chassis ground studs directly to low-impedance industrial earth ground using minimum 14 AWG copper wiring.
• Communication Cabling:
  • Route serial and EtherNet/IP cabling through dedicated wireways away from high-voltage motor power leads.
  • Terminate shielding drain wires at designated earth ground bars to suppress electromagnetic interference.

Frequently Asked Questions

• Q: What is the backplane current draw for the 1785-L80E controller?

  A: The module draws 3.3A from the chassis backplane power supply during standard operational cycles.

• Q: How much user memory is available on this processor?

  A: The controller features 100 KWords of total memory with a maximum user memory allocation of 48 Kilowords.

• Q: Can this unit execute I/O scans across 93 separate racks?

  A: Yes, the architecture supports a maximum of 93 I/O racks with scan times scaling from 3 ms to 10 ms based on link baud rates.

• Q: What type of backup battery is required for data retention?

  A: The unit utilizes the standard 1770-XYC lithium battery component to maintain RAM contents during power-down states.

• Q: What serial communication standards are supported by the embedded port?

  A: The single serial port is field-configurable to support RS-232, RS-423, and RS-422A physical standards.

• Q: Is hot-swapping supported on the PLC-5 chassis backplane?

  A: Standard PLC-5 backplanes do not support live hot-swapping; power must be disconnected before hardware insertion or removal.

• Q: What is the total maximum I/O configuration capacity?

  A: The system handles a maximum total of 3072 mixed I/O points or 3072 inputs paired with 3072 complementary outputs.

• Q: How does ambient temperature affect continuous controller operation?

  A: The hardware operates reliably within an ambient temperature range of 0 deg C to 60 deg C when cabinet ventilation is maintained.