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    Apter Power checks network phase, RSNetWorx records, revision, project evidence, and condition before sourcing.

1785-L20C15

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Allen-Bradley 1785-L20C15 is a 16 K-word ControlNet 1.5 PLC-5/20C15 controller with one redundant-media network port, fixed DH+, and configurable DH+/Remote I/O.
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Technical specifications for 1785-L20C15

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L20C15
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/20C15 ControlNet 1.5 Programmable Controller
  • Stock:
    1
  • Maximum user memory:
    16 K words
  • Maximum total I/O:
    512 any mix
  • ControlNet rate:
    5 Mbit/s
  • ControlNet ports:
    1 redundant-media port
  • Network update time:
    2…100 ms
  • Maximum I/O map entries:
    64
  • Maximum DIF/DOF size:
    2,000 words
  • Maximum ControlNet racks:
    3
  • Maximum ControlNet devices:
    12
  • Maximum total network nodes:
    48 without repeaters; 99 with repeaters
  • Maximum I/O chassis:
    13 total; 12 remote
  • Backplane current:
    2.7 A at 5 V DC
  • Heat dissipation:
    54 BTU/h
  • Operating temperature:
    0…60 °C
  • Storage temperature:
    -40…85 °C
  • Relative humidity:
    5…95%, noncondensing
  • Weight:
    1.45 kg
  • Estimated shipping dimensions:
    4.8 x 16.5 x 27 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 Phase 1.5 Boundary Compact Schedule Status-Led Diagnosis Product Applications

Features:

  • ControlNet 1.5 role: scheduled and unscheduled traffic through redundant media
  • Compact capacity: 16 K words, 512 I/O, and twelve ControlNet devices
  • Legacy coexistence: fixed DH+, configurable DH+/RIO, and serial channels remain available
1785-L20C15 brings deterministic ControlNet communication to the smallest phase 1.5 PLC-5 capacity class.

Its engineering boundary is explicit: network scheduling, update time, map entries, and device count must fit a compact controller rather than being copied from larger C15 catalogs.

A replacement record should include network phase, RSNetWorx file, NUT, rack and device maps, NAP cable, Series/Revision, project, and battery.
Apter Power can review 1785-L20C15 network phase, scheduling file, revision, and hardware evidence before sourcing.
Allen-Bradley 1785-L20C15 PLC-5/20C15 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.
  • Network generation: keep phase 1.0 or 1.25 products out of the ControlNet 1.5 design.
  • Reserved channel: treat Channel 2 as the controller’s ControlNet role.
  • Service connection: use the specified 1786-CP NAP cable and avoid commercial RJ-style cables.
  • Map entries: remain within sixty-four I/O map records.
  • Device scope: schedule no more than twelve ControlNet devices and three racks for this controller.
  • Update timing: configure the 2…100 ms NUT in RSNetWorx against the real task and I/O demand.
  • General state: read PROC, FORCE, COMM, and BATT before network changes.
  • ControlNet state: interpret A/B media indicators together with RSNetWorx diagnostics.
  • Configuration proof: compare keeper, scheduled connection, project, and physical-media evidence before replacement.
  • Compact deterministic I/O control: schedule supported ControlNet racks and devices for a 16 K PLC-5 application.
  • Redundant-media ControlNet nodes: use the documented A/B network paths for supported industrial communication.
  • Mixed legacy communication: retain fixed DH+, Remote I/O, and serial duties beside the ControlNet system.
Description
ControlNet phase is the first integration boundary for 1785-L20C15: Rockwell states that phase 1.0 or 1.25 products do not operate in the documented 1.5 system. RSNetWorx supplies the schedule used by the deterministic network.

Compact PLC-5/20C15 control is provided by 1785-L20C15 through 16 K words, one redundant-media ControlNet port, fixed DH+, configurable DH+ or Remote I/O, and serial communication. The controller retains a 512-I/O any-mix boundary.

Before commissioning 1785-L20C15, match the Series/Revision, PLC-5 project, RSNetWorx file, network phase, and 1786-CP NAP cable. Connector resemblance is insufficient because Rockwell warns against substituting a commercial RJ-style lead for service access.
Revisions

Revision Part #

Also known as

1785-L20C15 Series C
1785-L20C15/C, Series C, Revision U.2
1785-L20C15 Series D
1785-L20C15/D, Series D, Revision L.2
1785-L20C15 Series E
1785-L20C15/E, Series E, Revision K.2
1785-L20C15 Series F
1785-L20C15/F, Series F, Revision E.2
Alternative Names
Allen-Bradley 1785-L20C15 Rockwell Automation 1785-L20C15 AB 1785-L20C15 1785L20C15 1785 L20C15 PLC-5/20C15 ControlNet 1.5 Programmable Controller 1785-L20C15
Technical notes
Make network generation the first gate for 1785-L20C15: earlier phase 1.0 and 1.25 devices are excluded from its phase 1.5 architecture. Build scheduled connections in RSNetWorx, reserve Channel 2 for ControlNet, and use the specified 1786-CP NAP service cable instead of a commercial RJ-style lead.
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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 an older ControlNet node fail when added beside 1785-L20C15?
Identify the node’s network phase and remove phase 1.0 or 1.25 products from the ControlNet 1.5 design; then reschedule the supported device in RSNetWorx.
Why can a new ControlNet device be rejected by 1785-L20C15 even when a node address is available?
A free address does not prove that the compact schedule has room. Review devices, racks, map entries, DIF/DOF usage, NUT, and connection demand in RSNetWorx before adding the node.
What cable should be used at the NAP port of 1785-L20C15?
Use the specified 1786-CP NAP cable for programming or network access. Do not substitute a commercial RJ-style cable, because Rockwell warns that it can cause network failure.
Why can 1785-L20C15 show healthy media lights yet reject scheduled I/O?
Open the RSNetWorx project, compare keeper and schedule state, NUT, device identity, map entries, and controller project; healthy A/B media does not prove a valid schedule.
Can 1785-L20C15 use a 1785-ME16 memory module?
No. Rockwell states that 1785-ME16 cannot be used with ControlNet PLC-5 processors; identify a listed compatible memory module and verify capacity before relying on stored recovery.
What should stop a 1785-L20C15 replacement when the existing RSNetWorx file is unavailable?
Do not commission scheduled I/O until the network schedule, keeper state, NUT, and controller project are reconstructed and validated. Healthy media alone cannot replace the missing configuration.

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