Allen-Bradley ControlLogix Parts

PLC321 parts available

ControlLogix is Rockwell’s chassis-based Logix platform for mid-to-large applications. This hub covers 1756 CPUs, I/O, communication modules, power supplies, and chassis used across manufacturing and process plants. Need repair? We offer PLC repair services.

Featured ControlLogix in stock

High-value Milwaukee inventory matched to this product line.

Allen-Bradley 1756-L84ES

1756-L84ES

New

$4,899.99 USD

Browse by Module Type

CPU Processors

54 parts

Power Supply DC

50 parts

Ethernet Communication

33 parts

Analog Input

16 parts

Power Supply AC

12 parts

Chassis

11 parts

Digital Output

9 parts

Analog Output

7 parts

ControlNet Communication

5 parts

Digital Input

5 parts

Relay Output

5 parts

Redundancy Module

5 parts

Search all inventory
Part NumberDescription
1756-L81EAllen-Bradley 1756-L81E /B ControlLogix Processor - New Surplus (Sealed) · New · $2,649.99 USD
1756-L83EPAllen Bradley 1756-L83EP /B ControlLogix 5580 Process Controller Sealed Surplus · New · $4,449.99 USD
1756-L83EAllen Bradley 1756-L83E / 1756L83E Ser B ControlLogix 5580 Controller (sealed) · New · $4,889.99 USD
1756-L81ESAllen Bradley 1756-L81ES /B GuardLogix 5580 Safety Controller - Sealed Surplus · New · $3,499.99 USD
1756-L84ESAllen Bradley 1756-L84ES /B GuardLogix5580 Processor - New Surplus (Sealed) · New · $4,899.99 USD
1756-OV32EAllen Bradley 1756-OV32E Ser A ControlLogix DC Fused Sinking Output 10-30V DC · Used · $139.99 USD
1756-PA75Allen Bradley 1756-PA75 /B Controllogix AC Power Supply 1756PA75 · Used · $199.99 USD
1756-A13Allen Bradley 1756-A13 /B ControlLogix 13 Slot Rack Chassis 1756A13 · Used · $199.99 USD
1756-IB32Allen Bradley 1756-IV16 Ser A C01 F/W Rev 3.2 16Point DC Input Module - Open Box · New – Open box · $249.99 USD
1756-en2txtAllen Bradley 1756-EN2TXT /D CIXENET/IP MODULE Ser D FW 10.001 - Missing Cover · Used · $319.99 USD
1756-A4Allen Bradley 1756-A4 ControlLogix 4 Slot Chassis I/O Rack 1756A4 Backplane · Used · $349.99 USD
1756-IV16Allen Bradley 1756-IV16 Ser A ControlLogix Digital Input Module Sealed Surplus · New · $349.99 USD
17560F8Allen Bradley 1756-0F8 / 1756-OF8 Output Module Ser A 17560F8 - Sealed · New · $589.99 USD
1756-PB72Allen Bradley 1756-PB72 Ser C ControlLogix 24V DC Standard Power Supply 1756PB72 · New – Open box · $699.99 USD
1756-A10Allen Bradley 1756-A10 /C ControlLogix 10 Slot Chassis - 2016 Sealed Surplus · New · $749.99 USD
1756-L72SALLEN BRADLEY 1756-L72S SER B Logix 5572S Automation Controller 4M/2M · Used · $749.99 USD
1756-M08SEAllen Bradley 1756-M08SE /B ControlLogix 8 Axis SERCOS Module - Sealed Surplus · New · $849.99 USD
1756-HIST2GAllen Bradley 1756-HIST2G /A ControlLogix Historian ME Module 1756HIST2G SER A · Used · $1,499.99 USD
1756-OF8IHAllen Bradley 1756-OF8IH Ser A ControlLogix 8-Point HART Analog Output Module · New – Open box · $1,599.99 USD
1756-L75Allen Bradley 1756-L75 /B ControlLogix Logix5575 Processor 32MB 1756L75 Sealed · New · $2,299.99 USD
1756-L83ESAllen Bradley 1756-L83ES /B ControlLogix 5580 GuardLogix Controller 1756L83ES · Seller refurbished · $2,549.99 USD
1756-RM2Allen Bradley 1756-RM2 /A ControlLogix Redundancy Module - Sealed Surplus · New · $2,999.99 USD
1756-L82ESAllen Bradley 1756-L82ES /B GuardLogix Logix 5580 Controller Sealed Surplus · New · $4,199.99 USD
1756-L84E2024 Allen Bradley 1756-L84E / 1756L84E Ser B ControlLogix 5580 Controller - Sealed · New · $4,499.99 USD
1756-L83ES2023 Allen Bradley 1756-L83ES /B GuardLogix 5580 Controller - New Surplus Sealed · New · $4,599.99 USD
1756ControlLogix
1756-0B16DAllen Bradley 1756-0B16D / 17560B16D Ser A DC DIAG Output Module 16 Point
1756-0B8ControlLogix Module
1756-181EControlLogix Module
1756-183EControlLogix Module
1756-2WSHardy Instruments 1756-2WS Weigh Dual Scale Module, 2-Ch, 8 Load Cells/Points
1756-A10TSCControlLogix Module
1756-A13TSCControlLogix Module
1756-A1717 SLOT CONTROLLOGIX CHASSIS Chassis, Mounting, 17 Slots, 30" x 36" x 8".
1756-A17TSCControlLogix Module
1756-A4TSCControlLogix Module
1756-A5TSCControlLogix Module
1756-A6TSCControlLogix Module
1756-A7PLC Module I/O Chassis 7 Slot 1756 I/O Modules
1756-CJCCold Junction Compensation Thermistors, 2 pcs
1756-CMS1B1Allen Bradley (Rockwell Automation) 1756 Net Priced Products - 1756-CMS1B1
1756-CN2Allen Bradley 1756-CN2 / 1756CN2 Ser C ControlLogix Communication Module
1756-CN2RCommunication Interface Module Single-port Redundant-media ControlNet Interface Module
1756-CNBAllen-Bradley 1756-CNB/D ControlLogix ControlNet Bridge Module E01
1756-CNBKAllen Bradley (Rockwell Automation) 1756 B57 - 1756-CNBK
1756-CNBRCommunication Interface Module Single-port Redundant-media ControlNet Interface Module
1756-DHRIOCommunication Interface Module Two-port DH-plus or universal Remote I/O communication Interface Module
1756-DHRIOXTControlLogix-XT DH+/RIO Bridge/Scanner Module, 2-Ports DH+/Remote I/O
1756-DNBAllen Bradley 1756-DNB / 1756DNB Ser B DeviceNet Communication Module
1756-EN2F1756-EN2F ControlLogix EtherNet/IP Fiber Module 10/100 Mbps

ControlLogix buying & repair guidance

Use the catalog string from the nameplate when ordering or quoting. Need a hand? Contact us or request a quote.

Common ControlLogix failures

  • CPU major faults after power loss or corrupted projects
  • 1756 Ethernet modules dropping connections under load
  • Power supply failures causing chassis-wide resets
  • I/O module channel damage from field wiring faults

Seeing these symptoms? PLC repair or search in-stock replacements.

Series & revision differences

L7x and L8x controllers differ in memory, motion capacity, and security features. Series suffixes on I/O and comms modules can change EDS files and firmware requirements. Match series when swapping critical modules.

Confirm the full catalog and series before you buy. Condition & authenticity · Quote a specific series

Repair vs replace

Repair a ControlLogix CPU or module when the rack layout and program must stay identical. Replace when moving to GuardLogix, adding CIP Motion capacity, or retiring an obsolete L6x/L7x generation.

Start a repair quote · Request a replacement quote · Search all inventory

Still have questions?

Find answers to shipping, warranties, repairs, and more.

Yes. NJT Automation maintains surplus and refurbished ControlLogix inventory in Milwaukee, with additional sourcing when a specific catalog number is not on the shelf. In-stock items above can ship the same business day when ordered by the cutoff.
In most cases, yes. We offer mail-in repair with testing and a warranty. Send photos and the catalog/series from the nameplate for a repair quote, often faster than waiting on obsolete new stock.
Request a quote with the full catalog string and series from the nameplate. We can confirm whether a nearby series is compatible or source the exact revision you need.
In-stock Milwaukee inventory typically ships the same business day when ordered before the cutoff, with ground and expedited options. Local pickup can be arranged. Contact us to schedule.
Disclaimer

Trademarks & Compatibility

All trademarks, service marks, trade names, brand names, and logos displayed on this website are the property of their respective owners. Any references to manufacturers, products, or brands are for identification and compatibility purposes only and do not imply any affiliation with, endorsement by, sponsorship from, or authorization by the respective trademark owners.

Independent Supplier

NJT Automation is an independent supplier of surplus, refurbished, and pre-owned industrial automation equipment. Unless expressly stated otherwise, NJT Automation is not an authorized distributor, dealer, representative, or affiliate of the original equipment manufacturer (OEM) for any products offered on this website.

Product Condition & Warranty

Products sold by NJT Automation may be surplus inventory, discontinued models, older series, or units with earlier manufacturing date codes than those currently available from the OEM or its authorized distribution network. As NJT Automation is not an authorized distributor, manufacturer warranties, support programs, and other OEM services may not apply. Any warranty provided is solely that of NJT Automation, where applicable.

Firmware & Software Licensing

Certain programmable logic controllers (PLCs), drives, HMIs, and other electronic products may require firmware to operate. While some products may include firmware, NJT Automation makes no representations or warranties regarding whether firmware is installed, the firmware version or revision level, its compatibility with your application, or its licensing status.

NJT Automation does not provide, obtain, transfer, or license firmware on behalf of customers. We make no representation regarding your ability or legal right to obtain, download, install, or use firmware from the OEM, its authorized distributors, or any other source. It is the customer's sole responsibility to ensure compliance with all applicable End User License Agreements (EULAs), software licenses, intellectual property rights, and other terms governing the acquisition, installation, and use of firmware.