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1764-LRP

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Allen-Bradley 1764-LRP is the enhanced MicroLogix 1500 processor with 14 KB memory and a second, isolated RS-232 communication channel.
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Technical specifications for 1764-LRP

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1764-LRP
  • Product Family:
    MicroLogix
  • Product Type:
    MicroLogix 1500 RS-232 Processor
  • Stock:
    1
  • User memory:
    14 KB
  • Communication ports:
    2
  • Additional interface:
    Isolated RS-232C Channel 1
  • Supported protocols:
    DF1, DH-485, Modbus RTU slave, ASCII
  • Programming software:
    RSLogix 500 version 4.00 or later
  • Expansion I/O:
    Up to 8 or 16 modules under documented system conditions
  • Expansion banks:
    Up to 2 with one approved expansion cable
  • Required end cap:
    1769-ECR or 1769-ECL
  • Operating temperature:
    0…55 °C
  • Enclosure:
    Open-style
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    15.7x8.6x4.2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Singapore
  • 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 Dual Channel Roles Series & Firmware Expansion Banks Product Applications

Features:

  • Enhanced processor: 14 KB user memory for MicroLogix 1500
  • Second serial path: isolated RS-232C Channel 1 on the processor
  • Conditional expansion: one or two I/O banks under documented series and firmware rules
1764-LRP serves MicroLogix 1500 projects that need more memory and a second serial communication duty.

Because the processor depends on a separate base unit, its channel and expansion capabilities cannot be evaluated from the processor label alone.

A valid replacement record should connect the full processor catalog to the base, series, firmware, software, port settings, I/O bank, and project archive.

Apter Power can coordinate official-document review, quotation, and sourcing support for 1764-LRP.
Allen-Bradley 1764-LRP MicroLogix 1500 RS-232 Processor 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.
  • Channel 0: preserve the base-unit port settings and communication-toggle recovery path.
  • Channel 1: assign the isolated processor port its own protocol, address, timing, and cable record.
  • Peer validation: test each serial conversation independently before both channels operate together.
  • Revision gate: read processor series and operating-system FRN from the installed hardware and status file.
  • Software match: use the RSLogix 500 version required by the selected processor and expansion features.
  • Upgrade control: back up the validated project and communication records before any operating-system change.
  • Module count: apply the documented 8- or 16-module condition instead of using one universal limit.
  • Second bank: use only one approved expansion cable with a qualified power supply and end cap.
  • Loading review: calculate bus current and heat dissipation for the exact base, processor, and module order.
  • Two-path serial control: separate programming, operator, modem, or supported network-converter duties between channels.
  • Expanded MicroLogix 1500 systems: coordinate one or two Bulletin 1769 I/O banks under documented revision limits.
  • Recipe and data applications: use the enhanced processor memory and supported data-handling facilities in qualified projects.
Description
1764-LRP is the enhanced processor for a MicroLogix 1500 base unit. Rockwell Automation identifies it by 14 KB memory and an additional isolated RS-232C port, giving the controller two independently configurable communication channels when installed with the required base hardware.

The second port is the defining engineering advantage of 1764-LRP. Channel 0 remains on the base unit while Channel 1 is carried by the processor, allowing supported DF1, DH-485, Modbus RTU slave, or ASCII duties to be separated according to the documented processor series, firmware, and application design.

In a MicroLogix 1500 design, 1764-LRP provides its expanded processor role only when paired with the documented base and expansion architecture. The complete processor catalog therefore identifies a dual-channel design rather than a memory-only upgrade to the standard LSP configuration.
Revisions

Revision Part #

Also known as

1764-LRP Series A
1764-LRP/A, Series A
1764-LRP Series B
1764-LRP/B, Series B
1764-LRP Series C
1764-LRP/C, Series C
Alternative Names
Allen-Bradley 1764-LRP Rockwell Automation 1764-LRP AB 1764 LRP 1764LRP processor MicroLogix 1500 enhanced processor 1764 LRP RS-232 CPU
Technical notes
Treat Channel 1 on 1764-LRP as an independent serial path rather than a copy of base-unit Channel 0. Record its protocol and peer role, match the approved cable and handshaking, and verify the applicable processor series and operating-system revision before downloading a project that uses the second port.
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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.
Why might Channel 1 on 1764-LRP fail while Channel 0 still communicates?
Check Channel 1 protocol, baud, parity, node, cable, handshaking, isolation, and peer role independently; the communication toggle affects Channel 0 and does not validate the processor port.
Which revision checks matter before expanding a 1764-LRP system to sixteen I/O modules?
Confirm processor series C or later, firmware FRN 6 or later, compatible base series, RSLogix 500 version 5.10 or later, approved bank power, cable, and end cap.
How should a technician install 1764-LRP into an existing base unit?
Remove base power, align the processor guide rails, avoid pressing on its connector, push until fully engaged, close the actuator, and verify the latch before re-energizing.
Can 1764-LRP and 1764-LSP use the same communication plan without review?
No. The LRP adds an isolated processor-mounted Channel 1; compare port assignments, cables, protocols, messages, and project settings before substituting the standard processor.
What should be recorded before replacing an operating 1764-LRP?
Capture the base catalog, processor series and FRN, RSLogix version, both channel configurations, I/O bank order, power calculations, memory modules, project archive, and fault history.
How can 1764-LRP serial throughput problems be isolated from controller scan behavior?
Trend message execution, channel status, retries, peer response time, baud rate, and scan loading; test each channel alone before changing application timing or adding network traffic.