Allen-Bradley 1785-L20C
Allen-Bradley 1785-L20C
Allen-Bradley 1785-L20C
Allen-Bradley 1785-L20C
Allen-Bradley 1785-L20C
Allen-Bradley 1785-L20C
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1785-L20C

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The Allen-Bradley 1785-L20C PLC-5 is a ControlNet programmable controller and processor designed specifically for industrial automation.
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Technical specifications for 1785-L20C

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L20C
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/20C ControlNet Processor
  • Stock:
    1
  • Processor Designation:
    PLC-5/20C
  • Memory Capacity:
    16K words
  • ControlNet Channels:
    1
  • Serial Communication:
    Supported
  • Data Highway Plus:
    Supported
  • Remote I/O:
    Supported
  • Battery:
    1770-XYC
  • Memory Modules:
    1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100
  • Chassis Location:
    Leftmost slot in a supported 1771 chassis
  • Keying Locations:
    Between 40 and 42; between 54 and 56
  • Operating Temperature:
    0 to 60°C
  • Storage Temperature:
    -40 to 85°C
  • Relative Humidity:
    5% to 95%, non-condensing
  • Dimensions:
    4.7 × 16.5 × 27.3 cm
  • Weight:
    1.45 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 ControlNet Fit Memory and Chassis Replacement Control Application
  • Coordinates the PLC-5 application and ControlNet communications from the controller position of a 1771 chassis
  • Supports the processor family’s documented serial, Data Highway Plus, and Remote I/O communication paths
  • Replacement requires both the saved controller project and the original ControlNet network context

1785-L20C places PLC-5 execution and ControlNet communication in the controller position of a 1771 chassis.

Its communication options also cover serial, Data Highway Plus, and remote-I/O functions documented for the processor family.

Successful maintenance depends on restoring both the controller application and the network context expected by the installed ControlNet equipment.

Availability, condition, price, and shipping time for 1785-L20C are confirmed during quotation.

Allen-Bradley 1785-L20C PLC-5/20C ControlNet 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 processor includes one onboard ControlNet communication channel.
  • Earlier PLC-5/20C catalogs belong to the documented 1.0/1.25 ControlNet phase.
  • Network node and schedule information must agree with the installed ControlNet system.
  • The official processor table identifies 16K words of user memory.
  • The processor occupies the leftmost slot of a supported 1771 chassis.
  • Documented memory-module options include 1785-ME16 through 1785-M100.
  • Save the PLC-5 project and channel configuration before removal.
  • Record chassis keying, rack allocation, battery condition, and network settings.
  • Commission the controller and ControlNet path together after replacement.
  • PLC-5/20C control systems operating on documented ControlNet 1.25 networks
  • 1771 architectures requiring a 16K-word processor with onboard ControlNet communication
  • Control applications combining ControlNet with serial, DH+, or Remote I/O communication
Description
Allen-Bradley 1785-L20C is the 16K-word PLC-5/20C catalog for 1771 systems that use the earlier onboard ControlNet communication generation.

Its controller position is the leftmost slot of a supported chassis, where it can coordinate as many as four documented I/O racks while retaining serial, Data Highway Plus, and remote-I/O capability.

Service preparation should capture the exact Series E nameplate, ControlNet phase and schedule, node identity, rack addresses, 1770-XYC battery, memory image, and verified ladder application.
Revisions

Revision Part #

Also known as

1785-L20C Ser E
1785-L20C/E, Series E, Rev E
Alternative Names
1785-L20C Allen-Bradley 1785-L20C Allen Bradley 1785-L20C PLC-5/20C 1785-L20C Bulletin 1785-L20C
Technical notes
1785-L20C replacement requires Series E identification, matching ControlNet phase, supported 1771 chassis, preserved PLC-5 project, network schedule, rack allocation, and channel settings; memory capacity alone does not establish compatibility.
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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.
What should be compared before replacing an Allen-Bradley 1785-L20C processor?
Compare the full catalog and Series, ControlNet phase, memory requirement, 1771 chassis, rack allocation, communication settings, battery, and saved PLC-5 project.
Can Allen-Bradley 1785-L20C be replaced directly by Allen-Bradley 1785-L20C15?
Do not assume a direct exchange. The ControlNet phase, firmware, project compatibility, network configuration, and connected devices must be reviewed before selecting the later processor.
Why is the ControlNet phase important when sourcing Allen-Bradley 1785-L20C?
The official family documentation separates earlier 1.0/1.25 processors from 1.5 catalogs, so network compatibility must be confirmed against the installed system.
What data should be backed up before removing Allen-Bradley 1785-L20C?
Save the PLC-5 application, data-table values, channel configuration, ControlNet schedule and node information, serial settings, and any memory-module copy used by maintenance.
Where must Allen-Bradley 1785-L20C be installed in a 1771 chassis?
The official specification places the processor in the leftmost slot of a supported 1771 chassis; confirm chassis compatibility and keying before insertion.
What can prevent Allen-Bradley 1785-L20C from rejoining an existing ControlNet network?
A mismatched phase, node address, network schedule, media condition, firmware level, or restored controller configuration can prevent normal communication.
Is matching the memory size enough to select Allen-Bradley 1785-L20C?
No. The exact processor catalog, Series, network generation, chassis arrangement, communication ports, and saved application all affect interchangeability.