Allen-Bradley PLC-5 Parts
PLC • 257 parts available
PLC-5 systems still run critical processes in many facilities. Browse 1771 I/O, 1785 processors, and related PLC-5 hardware for sustainment. Need repair? We offer PLC repair services.
Best-selling PLC-5 parts
All best-selling parts →The PLC-5 part numbers NJT Automation sells most often, ranked by lifetime units sold.
| Part Number | Description | Price | |
|---|---|---|---|
| 1785-L11B/E | Allen-Bradley 1785-L11B/D PLC-5 Processor Ser. D 1785-L11B · New – Open Box | $549.99 USD | |
| 1771-NBRC | Allen-Bradley 1771-NBRC A HIGH RESOLUTION ISOLATED ANALOG Module PLC5 1 Year Wty · Refurbished | $2,999.99 USD | |
| 1771-NB4T | Allen Bradley 1771-NB4T Ser A HIGH RESOLUTION ISOLATED ANALOG SERIES MODULE PLC5 · Used | $2,999.99 USD | |
| 1771-0FE1 | Analog Ser B Output Module | — | |
| 1771-A1B | PLC-5 I/O Chassis Assembly, 4 Slot, Back-panel mount | — | |
| 1771-A2B | PLC Module I/O Chassis 8 Slot 1771 I/O Modules | — | |
| 1771-A3B | PLC-5 I/O Chassis Assembly 12 Slot, 19-inch Rack Mountable | — | |
| 1771-A3B1 | PLC-5 I/O Chassis Assembly 12 Slot 19" Back-panel mount | — | |
| 1771-A4B | PLC-5 I/O Chassis Assembly, 16 Slot, Back-panel mount | — | |
| 1771-AA | Allen Bradley 1771-AA | — | |
| 1771-ACN | Single-port Non-Redundant media ControlNet Communication Interface Module, ControlNet 1.0 & 1.25, 1771 I/O Adapter | — | |
| 1771-ACN15 | Adapter Module ControlNetT I/O Adapter Port | — | |
| 1771-ACNR | Two-port Redundant Media ControlNet Interface Module | — | |
| 1771-ACNR15 | Adapter Module ControlNetT I/O Adapter Port | — | |
| 1771-AD | 1771-AD PLC-5 I/O Chassis Assembly, 16-Slot, Back-Panel Mount | — | |
| 1771-AF | Communication Fiber Optic Converter Module Converts Twinax Electrical Signals to Light and Back to Electrical | — | |
| 1771-AF1 | 1771-AF1 Fiber-Optic Converter Module, Stand-Alone Unit | — | |
| 1771-AL | 1771-AL PLC-2 Local I/O Adapter Module | — | |
| 1771-AR | Allen Bradley 1771-AR | — | |
| 1771-ARC | Plc-5 Remote Adapter Ser B I/O Module | — | |
| 1771-ASB | Plc-5 Remote I/o Adapter Module | — | |
| 1771-ASB/E | Allen-Bradley 1771-ASB Ser B 1771-ASB/B PLC-5 Remote I/O Adapter Module | — | |
| 1771-ASC | Universal Remote I/O Adapter Module for PLC-2/3/5, Communication Rate: 57.6 kbit/s | — | |
| 1771-CD | 1771 PLC-5 System, I/O Chassis Cable for 1771-P2 Power Supply, 1ft | — | |
| 1771-CE | PLC Power Supply Cable Assembly 1771 I/O Chassis to 1771-P2 Power Supply | — | |
| 1771-CF | Allen Bradley 1771-CF | — | |
| 1771-CFM | Programmable Logic Controller Module | — | |
| 1771-CK | Allen Bradley 1771-CK | — | |
| 1771-CL | Allen Bradley 1771-CL | — | |
| 1771-CP1 | PLC Power Supply Cable Assembly 1771 I/O Chassis to 1771-P7 Power Supply | — | |
| 1771-CP2 | PLC Power Supply Cable Assembly 1771 I/O Chassis to 1771-P7 Power Supply | — | |
| 1771-CR | 1771-CR PLC-2 Data Highway Processor cable, 10.5ft (3.2m) | — | |
| 1771-CXT | Terminator Plug PLC-5T Family Local I/O Bus Terminator Plug | — | |
| 1771-D810 | Allen Bradley 1771-D810 | — | |
| 1771-DA | PLC-5 ASCII I/O Module, 1.5K words/3K bytes, RS-232-C, Communication Rate: 110, 300, 600, 1200, 2400, 4800, 9600 baud | — | |
| 1771-DB | PLC-5 BASIC Module, PRT2/PRT1 Communication Ports, DF1 Protocol | — | |
| 1771-DC | Analog Output Module, 8 Outputs, Voltage, Isolated, Keyed, Enhanced | — | |
| 1771-DCM | Communication Module Discrete Data Transfer 8 words or Block Transfer 64 words | — | |
| 1771-DE | PLC-5 Absolute Encoder Module, 8 Outputs, 12 Encoder Input Bits per Module | — | |
| 1771-DFHD | Allen Bradley 1771-DFHD | — | |
| 1771-DL | 1771-DL PLC-5 System, Gray Encoder 12-24V Input Module | — | |
| 1771-DMC | Control Coprocessor Ser A Processor Module | — | |
| 1771-DMC1 | 1771-DMC1 Control Coprocessor Main Module, 1 Mbyte with Ethernet | — | |
| 1771-DMC4 | Allen Bradley 1771-DMC4 | — | |
| 1771-DR | 1771-DR I/O Logic Controller Module 5-24 VDC 2 AMP 192 VA | — | |
| 1771-DS | PLC-5 Latching Input Module, 10-27V DC, 8 Inputs, Logic 1: 10-27V DC, Logic 0: 0-4V DC | — | |
| 1771-DSX2 | 1771-DSX2 PLC-5 Information Processor Main CPU Module | — | |
| 1771-DSX4 | Allen Bradley 1771-DSX4 | — | |
| 1771-DXPS | 1771-DXPS Control Coprocessor Serial Expander Module | — | |
| 1771-E1C | Allen Bradley 1771-E1C | — |
PLC-5 buying & repair guidance
When ordering or requesting a quote, include the full catalog string from the unit's nameplate. Series and revision letters affect fit, firmware, and application compatibility.
Common PLC-5 failures
- Processor faults and memory errors after power events
- Program loss from failed backup batteries or EEPROM modules
- 1771 I/O module failures from field wiring shorts or overvoltage
- Remote I/O and DH+ adapter faults from cabling, termination, or aged transceivers
Series & revision differences
Enhanced PLC-5 processors and classic catalogs are not identical. Confirm DH+/ControlNet options and memory size on the nameplate.
Repair or replace?
Repair keeps legacy lines running. Long-term strategy usually migrates to ControlLogix; NJT can support both repair and replacement sourcing.
Still have questions?
Find answers to shipping, warranties, repairs, and more.
Frequently Asked Questions
Do you stock Allen-Bradley PLC-5 parts?
Yes. NJT Automation maintains surplus and refurbished PLC-5 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.
Can you repair PLC-5 PLC hardware?
In most cases, yes. We offer mail-in repair with testing and a 1-year warranty, with 2- and 3-year extended options available. Send photos and the catalog/series from the nameplate for a repair quote, often faster than waiting on obsolete new stock.
What if my exact series letter is not listed?
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.
How fast can PLC-5 parts ship?
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.