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1772-LX

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Allen-Bradley 1772-LX is the non-powered Mini-PLC-2/16 processor with 4K memory, support for up to 256 I/O, and selectable half-, one-, or two-slot addressing.
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Technical specifications for 1772-LX

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1772-LX
  • Product Family:
    Allen Bradley PLCs
  • Product Type:
    Mini-PLC-2/16 Processor
  • Stock:
    1
  • Maximum I/O Capacity:
    256
  • Addressing Modes:
    1/2-slot, 1-slot, or 2-slot
  • Memory Protection:
    Above word address 177
  • Mode Selection:
    Key switch
  • Diagnostics:
    Front-panel diagnostic indicators
  • Compatible Backup Memory:
    1772-MJ 4K or 1785-MJ 8K
  • Dimensions:
    4.7 × 15.8 × 26.8 cm
  • External Power Supply Support:
    Up to two external Bulletin 1771 power-supply modules
  • Local I/O Chassis Compatibility:
    1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B
  • Online Programming:
    Supported
  • Online Data Change:
    Supported
  • Backup Battery:
    Self-contained lithium battery for memory retention
  • Remote I/O Support:
    Via a 1771-SN sub-scanner
  • Weight:
    0.98 kg
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • 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 System Fit Addressing Control Replacement Control Application
  • Installs in the leftmost slot of a 1771 I/O chassis
  • Requires 1.25 A from the chassis backplane
  • Uses a self-contained lithium battery to retain memory for one year without AC power

1772-LX serves the Mini-PLC-2/16 configuration with a documented capacity of up to 256 I/O points.

Half-slot, one-slot, or two-slot addressing changes the I/O image, making the installed rack map essential replacement information.

The processor, external power design, EEPROM image, and saved application must be treated as one matched system rather than independent parts.

Availability, condition, price, and shipping time for 1772-LX are confirmed during quotation.

Allen-Bradley 1772-LX Mini-PLC-2/16 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.

  • The official manual identifies 1772-LX as the Mini-PLC-2/16 processor.
  • Mini-PLC-2/16 supports the documented maximum of 256 I/O.
  • The non-powered LX catalog must match the cabinet power arrangement.
  • Half-slot, one-slot, and two-slot addressing are documented for the processor family.
  • The addressing selection determines how field modules map into the I/O image.
  • The saved program and any EEPROM image must use the installed addressing mode.
  • Preserve the complete application before removing processor power.
  • Confirm chassis, external supply, EEPROM, and I/O layout against the machine records.
  • Prove inputs, controlled outputs, and processor diagnostics before return to service.
  • Legacy Mini-PLC-2/16 systems requiring the documented 256-I/O capacity.
  • PLC-2 machine-control maintenance with retained rack addressing and application data.
  • Like-for-like processor replacement where the external power design remains unchanged.
Description
Allen-Bradley 1772-LX is the Mini-PLC-2/16 processor catalog documented for PLC-2 installations requiring up to 256 I/O.

It shares the documented Mini-PLC-2 hardware architecture with selectable rack addressing, memory protection, a key-operated mode selector, and processor diagnostic indicators.

Before replacement, confirm the LX rather than LXP catalog, external power design, rack addressing, I/O layout, application backup, and EEPROM capacity.
Alternative Names
1772-LX Allen-Bradley 1772-LX Allen Bradley 1772-LX Mini-PLC-2/16 1772-LX 1772-LX Mini-PLC-2/16 Processor Mini-PLC-2/16 Processor 1772-LX
Technical notes
1772-LX replacement requires the exact Mini-PLC-2/16 catalog, external power arrangement, rack-addressing mode, 256-I/O layout, saved program, and EEPROM image; LX and powered LXP must not be confused.
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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.
How should a buyer verify Allen-Bradley 1772-LX for an installed Mini-PLC-2/16 system?
Match the LX catalog, I/O capacity, chassis, external supply, rack-addressing mode, saved program, and EEPROM type.
Can Allen-Bradley 1772-LX directly replace powered 1772-LXP?
Do not assume a direct replacement. The LXP contains a self-contained power supply, while the LX relies on the external system power arrangement.
What should be saved before removing Allen-Bradley 1772-LX?
Save the program, data-table organization, I/O addresses, rack-addressing mode, EEPROM image, and machine commissioning information.
Why is rack addressing important when replacing Allen-Bradley 1772-LX?
The processor supports half-slot, one-slot, and two-slot addressing; a mismatch changes the I/O image and can cause unintended operation.
Which backup memory can be used with Allen-Bradley 1772-LX?
The official manual documents the 1772-MJ 4K and 1785-MJ 8K EEPROMs, with the selected image required to match the current addressing mode.
What should be inspected before commissioning Allen-Bradley 1772-LX?
Inspect the chassis connection, keying, supply, mode switch, indicators, EEPROM identity, and every mapped I/O point against the preserved project.
Which evidence helps distinguish Allen-Bradley 1772-LX from powered catalog 1772-LXP during procurement?
Use clear processor and chassis nameplate photographs together with the cabinet power arrangement; also record rack addressing, EEPROM identity, I/O layout, and the validated backup reference.