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1775-LX

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Allen-Bradley 1775-LX links PLC-3 processor chassis in a multi-chassis expansion system and reports expansion-bus parity faults through its EBUS PARITY ERROR indicator.
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Technical specifications for 1775-LX

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1775-LX
  • Product Family:
    PLC-3
  • Product Type:
    PLC-3 Expansion Module
  • Stock:
    1
  • Function:
    Processor-chassis expansion-bus interface
  • Module Quantity:
    One per processor chassis
  • Maximum System Size:
    Four processor chassis
  • Expansion Cable Set:
    1775-CX
  • Distribution Panel:
    1775-CXD for three- and four-chassis systems
  • Terminators:
    1775-CXT for three-chassis systems
  • Diagnostic Indicator:
    EBUS PARITY ERROR
  • Dimensions:
    5.5 × 29.5 × 39.5 cm
  • Chassis Location:
    Single slot in a PLC-3 main or expansion chassis
  • Expansion Bus Connectors:
    Four 50-pin connectors labeled A, B, C, and D
  • Backplane Power Supply:
    +5 V and -15 V DC from the 1775-P1 through the chassis backplane
  • Backplane Current at 5 V DC:
    5 A
  • Backplane Current at -15 V DC:
    80 mA
  • Operating Temperature:
    0 to 60 °C
  • Storage Temperature:
    -40 to 85 °C
  • Relative Humidity:
    5% to 95%, noncondensing
  • Weight:
    2.5 kg
  • Tariff Code:
    8538900000
  • 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 Expansion Topology Cabling Diagnostics Application
  • Coordinates PLC-3 processor chassis in two-, three-, or four-chassis expansion layouts
  • Match 1775-CX cables, the 1775-CXD panel, and 1775-CXT terminators to the installed topology
  • Trace parity faults by checking chassis order and every expansion-bus channel connection

1775-LX is installed once in each PLC-3 processor chassis that participates in the documented expansion-bus arrangement.

Two-, three-, and four-chassis layouts use different combinations of 1775-CX cables, the 1775-CXD panel, and 1775-CXT terminators.

Chassis order and every channel connection must be restored exactly because a topology error can appear as an expansion-bus parity fault.

Availability, condition, price, and shipping time for 1775-LX are confirmed during quotation.

Allen-Bradley 1775-LX PLC-3 Expansion Module 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.

  • PLC-3 expansion can include as many as four processor chassis.
  • One 1775-LX expansion module is installed in each processor chassis.
  • The required panel and terminators depend on whether the system has two, three, or four chassis.
  • 1775-CX cable sets connect the expansion modules and distribution panel.
  • The 1775-CXD panel is used in three- and four-chassis systems.
  • 1775-CXT terminators are documented for the three-chassis topology.
  • The EBUS PARITY ERROR indicator reports a transmission parity fault between expansion modules.
  • Cable seating, routing, panel ports, and terminators should be checked as one complete bus.
  • Chassis placement and every channel connection must be restored from the recorded topology.
  • Two-chassis PLC-3 systems using a direct documented expansion cable arrangement.
  • Three-chassis PLC-3 systems using the distribution panel and required terminators.
  • Four-chassis PLC-3 systems using the documented distribution-panel topology.
Description
Allen-Bradley 1775-LX is the PLC-3 expansion-bus module installed one per processor chassis in multi-chassis PLC-3 systems.

The official expansion architecture supports as many as four processor chassis using 1775-CX cable sets, with a 1775-CXD distribution panel and 1775-CXT terminators where required by chassis count.

Before replacement, document every chassis position, channel, cable, distribution-panel connection, terminator, and parity indication because topology varies between two-, three-, and four-chassis systems.
Alternative Names
1775-LX Allen-Bradley 1775-LX Allen Bradley 1775-LX PLC-3 1775-LX 1775-LX PLC-3 Expansion Module PLC-3 Expansion Module 1775-LX
Technical notes
1775-LX replacement requires mapping every PLC-3 chassis, 1775-CX cable, 1775-CXD panel port, and 1775-CXT terminator; topology errors can trigger parity faults despite a correct module.
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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 can a buyer confirm Allen-Bradley 1775-LX for an existing PLC-3 expansion system?
Map the number of processor chassis, module positions, every 1775-CX cable, the 1775-CXD panel, and any 1775-CXT terminators before ordering.
What must be documented before disconnecting any cable from Allen-Bradley 1775-LX?
Record every processor-chassis position, expansion-module slot, cable-end label, channel connection, distribution-panel port, and terminator location so the topology can be reconstructed exactly.
Why can a replacement Allen-Bradley 1775-LX produce EBUS parity errors even when its catalog number is correct?
A crossed expansion channel, loose 1775-CX connection, incorrect 1775-CXD port, missing terminator, or wrong chassis sequence can corrupt communication across the expansion bus.
When is the 1775-CXD panel required with Allen-Bradley 1775-LX?
The expansion distribution panel is documented for three- and four-chassis PLC-3 systems.
What should be preserved before replacing Allen-Bradley 1775-LX?
Record chassis numbering, slot locations, all four-channel cable routes, distribution-panel ports, terminator locations, and current parity indications.
What does the EBUS PARITY ERROR indicator mean on Allen-Bradley 1775-LX?
It reports a parity error during transmission between expansion modules; inspect the complete bus topology and cables before returning the system to service.
When should Allen-Bradley 1775-LX troubleshooting include the entire PLC-3 expansion chain?
Inspect the full chain whenever a chassis disappears, parity faults recur, or communication changes after power cycling, because the fault may originate at another module, cable, panel, or terminator.