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1785-L40L

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Allen-Bradley 1785-L40L is a 48 K-word PLC-5/40L processor that adds an Extended-Local I/O path alongside two configurable DH+ or Remote I/O channels.
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Technical specifications for 1785-L40L

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L40L
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/40L Extended-Local I/O Programmable Controller
  • Stock:
    1
  • Maximum user memory:
    48 K words
  • Maximum total I/O:
    2,048 any mix or 2,048 inputs plus 2,048 outputs complementary
  • Communication channels:
    2 DH+ or Remote I/O; 1 Extended-Local I/O; 1 serial
  • Maximum I/O rack addresses:
    16 (0…17 octal)
  • Maximum I/O chassis:
    61 total; 16 extended-local; 60 remote
  • Maximum data-table file:
    32 K words
  • Backplane current:
    3.3 A at 5 V DC
  • Power dissipation:
    17.3 W
  • Operating temperature:
    0…60 °C
  • Storage temperature:
    -40…85 °C
  • Relative humidity:
    5…95%, noncondensing
  • Chassis position:
    Left-most slot in a supported 1771 chassis
  • Weight:
    1.42 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 Extended-Local Path Local vs Remote Map 48 K Project Gate Product Applications

Features:

  • Extended-Local path: one dedicated channel for nearby 1771 expansion chassis
  • 48 K-word controller: supports 2,048 I/O with a 32 K per-data-file ceiling
  • Mixed topology: two DH+/Remote I/O channels remain available beside local expansion
1785-L40L distinguishes local expansion traffic from two configurable network channels in a mid-capacity PLC-5 controller.

The extended-local path is the selection anchor: it changes chassis placement, cabling, response expectations, and replacement compatibility even when memory resembles another PLC-5/40.

Commissioning should document which chassis are local versus remote, their octal addresses, channel switches, terminators, project files, battery, and revision.
Apter Power can review the 1785-L40L extended-local topology, nameplate, project archive, and condition evidence before sourcing.
Allen-Bradley 1785-L40L PLC-5/40L Extended-Local I/O Programmable Controller 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.
  • Dedicated role: reserve the extended-local channel for the documented nearby expansion architecture.
  • Chassis boundary: keep the extended-local estate within sixteen chassis and record every cable segment.
  • Selection test: reject a controller that lacks the L-suffix hardware when the installed local path must remain.
  • Topology split: label every chassis as processor-resident, extended-local, or remote before edits.
  • Octal ownership: reconcile racks 0…17 with the two DH+/Remote I/O scan lists.
  • Performance proof: measure local response separately from remote link scan and cable constraints.
  • Application size: maintain the project inside the 48 K-word controller capacity.
  • Data-file rule: keep each data-table file below the separate 32 K-word maximum.
  • Recovery record: retain firmware, battery, memory-module, channel-switch, and checksum evidence together.
  • Extended-local 1771 control: operate supported nearby I/O chassis through the dedicated local-expansion path.
  • Mixed local and Remote I/O systems: combine extended-local chassis with two configured scanner links.
  • DH+ and serial coordination: use documented peer, programming, or serial roles beside the I/O architecture.
Description
Separating nearby expansion from Remote I/O is the defining engineering role of 1785-L40L. Its dedicated Extended-Local I/O path serves as many as sixteen local-expansion chassis while two configurable DH+ or Remote I/O channels retain the wider network duties.

A 48 K-word PLC-5/40L controller for 1771 systems, 1785-L40L supports 2,048 I/O in any mix and up to sixty remote chassis. The serial interface remains available beside the local and remote communication paths.

When an installed local-expansion architecture must remain, 1785-L40L should be matched by its L-suffix hardware, cabling, chassis assignments, octal rack map, and Series/Revision. A standard PLC-5/40 catalog does not establish the same physical role.
Revisions

Revision Part #

Also known as

1785-L40L Series B
1785-L40L/B, Series B, Revision S.2
1785-L40L Series C
1785-L40L/C, Series C, Revision U.2
1785-L40L Series D
1785-L40L/D, Series D, Revision L.2
1785-L40L Series E
1785-L40L/E, Series E, Revision K.2
Alternative Names
Allen-Bradley 1785-L40L Rockwell Automation 1785-L40L AB 1785-L40L 1785L40L 1785 L40L PLC-5/40L Extended-Local I/O Programmable Controller 1785-L40L
Technical notes
Identify the Extended-Local I/O path before moving a project to 1785-L40L. The controller supports sixteen extended-local chassis, but each data-table file remains limited to 32 K words and remote racks still obey their own channel, rate, cable, and termination constraints. Do not substitute a standard PLC-5/40 solely by memory size.
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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.
Why is the L suffix operationally important when replacing 1785-L40L?
The L identifies the dedicated Extended-Local I/O capability. Inventory the local-expansion cable and chassis first, and stop if the proposed spare does not reproduce that physical path.
How should sixteen extended-local chassis be accepted on 1785-L40L?
Record each chassis, rack address, cable segment, power source, adapter setting, and observed response; commission the extended-local chain before enabling the two remote scanner links.
What causes a project below 48 K words to exceed a limit on 1785-L40L?
Inspect the individual data-table file, keep it below 32 K words, review indirect addressing and conversion changes, and validate any reorganization in an offline copy.
How can 1785-L40L remote rack faults be separated from extended-local faults?
Use the chassis classification record, channel indicators, and scan lists; test the extended-local path and each remote channel independently while outputs are controlled.
Which software and revision evidence should accompany 1785-L40L maintenance?
Capture the RSLogix 5 project, controller Series/Revision, channel configuration, rack map, checksum, memory-module record, and battery status before edits or firmware work.
When should maintenance stop a 1785-L40L exchange involving an unidentified Extended-Local I/O cable?
Keep the installation de-energized until the dedicated local-expansion cable, chassis chain, and controller port are positively identified. Do not energize a standard PLC-5/40 path as an assumed substitute.

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