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1785-L40C15

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Allen-Bradley 1785-L40C15 is a 48 K-word ControlNet 1.5 PLC-5/40C15 processor supporting ninety-six map entries, sixty devices, and redundant network media.
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Technical specifications for 1785-L40C15

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L40C15
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/40C15 ControlNet 1.5 Programmable Controller
  • Stock:
    1
  • Maximum user memory:
    48 K words
  • Maximum total I/O:
    2,048 any mix
  • ControlNet rate:
    5 Mbit/s
  • ControlNet ports:
    1 redundant-media port
  • Network update time:
    2…100 ms
  • Maximum I/O map entries:
    96
  • Maximum DIF/DOF size:
    3,000 words
  • Maximum ControlNet racks:
    15
  • Maximum ControlNet devices:
    60
  • Maximum total network nodes:
    48 without repeaters; 99 with repeaters
  • Maximum data-table file:
    32 K words
  • Backplane current:
    3.3 A at 5 V DC
  • Heat dissipation:
    59 BTU/h
  • Operating temperature:
    0…60 °C
  • Storage temperature:
    -40…85 °C
  • Relative humidity:
    5…95%, noncondensing
  • Weight:
    1.42 kg
  • Estimated shipping dimensions:
    4.9 x 16.5 x 27.4 cm
  • 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 Schedule Budget Media & Keeper 48 K Integration Product Applications

Features:

  • Mid-range schedule: ninety-six maps, sixty devices, and fifteen ControlNet racks
  • 48 K-word control: PLC-5/40 capacity with a 32 K data-table-file ceiling
  • Redundant media: ControlNet A/B paths with RSNetWorx-managed scheduled connections
1785-L40C15 balances a 48 K PLC-5 application with a substantially larger ControlNet schedule than the compact C15 model.

The controller is selected by the whole schedule budget—maps, DIF/DOF words, devices, racks, NUT, and phase—not by the presence of ControlNet connectors.

Acceptance should pair the RSNetWorx file with the PLC-5 project, media plan, Series/Revision, memory module, battery, NAP cable, and diagnostics record.
Apter Power can compare the 1785-L40C15 schedule budget, phase, revision, and project evidence before sourcing coordination.
Allen-Bradley 1785-L40C15 PLC-5/40C15 ControlNet 1.5 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.
  • Map capacity: retain no more than ninety-six I/O map entries.
  • Transfer size: keep DIF/DOF configuration inside the 3,000-word boundary.
  • Device estate: schedule at most sixty devices and fifteen racks for this catalog.
  • Redundant paths: verify both ControlNet media channels, taps, termination, and status indications.
  • Keeper state: align keeper and RSNetWorx schedule with the controller project before run.
  • NAP access: use 1786-CP for service and reject commercial RJ-style substitutes.
  • File rule: retain the 32 K-word limit for every data-table file.
  • Phase boundary: exclude phase 1.0 or 1.25 products from the phase 1.5 system.
  • Revision record: match Series C-F firmware evidence to the supplied nameplate before change control.
  • Medium ControlNet process control: schedule supported devices and racks for a 48 K PLC-5 application.
  • Redundant-media I/O networks: operate documented ControlNet A/B paths with RSNetWorx configuration.
  • PLC-5 network modernization: preserve deterministic I/O while auditing DH+, Remote I/O, and serial dependencies.
Description
Schedule growth is the principal engineering context for 1785-L40C15. Its ControlNet 1.5 design manages ninety-six I/O map entries, 3,000 DIF/DOF words, sixty devices, and fifteen racks through an RSNetWorx network schedule.

One redundant-media ControlNet port, configurable DH+ or Remote I/O communication, and serial connectivity place 1785-L40C15 in the 48 K-word PLC-5/40C15 tier for the 1771 platform.

Integration of 1785-L40C15 depends on phase 1.5 membership, keeper and NUT configuration, the PLC-5 project, Series/Revision, and the specified 1786-CP NAP cable. Media continuity alone does not establish an accepted scheduled-I/O configuration.
Revisions

Revision Part #

Also known as

1785-L40C15 Series C
1785-L40C15/C, Series C, Revision U.2
1785-L40C15 Series D
1785-L40C15/D, Series D, Revision L.2
1785-L40C15 Series E
1785-L40C15/E, Series E, Revision K.2
1785-L40C15 Series F
1785-L40C15/F, Series F, Revision E.2
Alternative Names
Allen-Bradley 1785-L40C15 Rockwell Automation 1785-L40C15 AB 1785-L40C15 1785L40C15 1785 L40C15 PLC-5/40C15 ControlNet 1.5 Programmable Controller 1785-L40C15
Technical notes
For 1785-L40C15, validate the RSNetWorx schedule before treating media status as acceptance. The controller is limited to ninety-six I/O map entries, sixty ControlNet devices, fifteen racks, and 3,000 DIF/DOF words; it also rejects phase 1.0 or 1.25 products in the documented ControlNet 1.5 architecture during commissioning.
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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 can a ControlNet expansion fail on 1785-L40C15 even when fewer than sixty devices are connected?
Device count is only one schedule resource. Review active map entries, DIF/DOF words, rack use, inhibited records, NUT, and the PLC-5 project before approving another connection.
Why might redundant media on 1785-L40C15 not provide a valid network after replacement?
Check A/B taps, termination, node address, keeper, NUT, RSNetWorx schedule, and controller project; two healthy cables do not prove the replacement holds the accepted configuration.
What happens if a phase 1.25 product is connected to 1785-L40C15?
Rockwell states that earlier-phase products do not operate in the ControlNet 1.5 system. Identify and remove the older device, then rebuild and validate the supported schedule.
How should a data-table growth issue be handled on 1785-L40C15?
Keep the affected file within 32 K words, check total project memory, indirect addresses and mapped transfers, and test any reorganization offline before rescheduling the network.
Can a commercial RJ-style lead be used for service access to 1785-L40C15?
No. Use the specified 1786-CP NAP cable; Rockwell warns that a commercial RJ-style cable can cause network failure. Inspect the service lead before connecting a laptop.
How should 1785-L40C15 be returned to service after both ControlNet media paths are replaced?
Verify taps and termination on each path, then reconcile node address, keeper, NUT, RSNetWorx schedule, and controller project. Enable scheduled I/O only after physical and logical checks agree.