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1785-L11B

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Rack 3 defines the remote-chassis boundary for 1785-L11B, the compact PLC-5/11 controller with one configurable DH+/Remote I/O channel.
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Technical specifications for 1785-L11B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L11B
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/11 Enhanced Programmable Controller
  • Stock:
    1
  • Controller family:
    PLC-5/11 Enhanced Programmable Controller
  • Maximum user memory:
    8 K words
  • Total I/O maximum:
    512 any mix or 384 inputs + 384 outputs complementary
  • Communication ports:
    1 DH+/Remote I/O channel and 1 configurable serial port
  • Maximum rack addresses:
    4 rack addresses (0…3)
  • Maximum I/O chassis:
    5 total; 4 remote, with rack 3 required
  • Backplane current:
    2.3 A at 5 V DC
  • Operating temperature:
    0…60 °C
  • Storage temperature:
    -40…85 °C
  • Relative humidity:
    5…95%, noncondensing
  • Vibration:
    2 g at 10…500 Hz
  • Operating shock:
    30 g
  • Non-operating shock:
    50 g
  • Enclosure type:
    Open style
  • Battery:
    1770-XYC
  • Chassis location:
    Left-most slot in supported 1771 chassis
  • Model-specific boundary:
    rack 3 is required for the remote-chassis allocation
  • 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 Rack 3 Boundary Channel 1A Role Memory Recovery Product Applications

Features:

  • Compact capacity: 8 K-word processor with a 512-I/O any-mix ceiling
  • Single network channel: Channel 1A is assigned to DH+ or Remote I/O duty
  • Defined remote layout: rack addresses 0…3 with the remote chassis assigned to rack 3
1785-L11B serves smaller 1771 systems where one configurable control-network channel and one serial path are sufficient.

Its distinctive engineering constraint is not just the smaller chassis count but the explicit rack-3 placement used for the remote allocation.

Selection and recovery records should link the exact catalog to the octal rack map, battery condition, EEPROM plan, channel role, and archived application.
For 1785-L11B, Apter Power can coordinate document checks for rack allocation, project identity, quotation, and sourcing.
Allen-Bradley 1785-L11B PLC-5/11 Enhanced 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.
  • Remote allocation: reserve rack 3 for the documented remote chassis rather than distributing remote I/O across the four addresses by assumption.
  • Octal record: compare rack addresses 0…3 with the project and physical adapter switches before reconnecting the link.
  • Expansion stop: treat five total chassis and four remote chassis as model limits, not targets that can be extended by spare cable capacity.
  • Mode choice: configure the single combined channel for DH+ or Remote I/O according to the installed network task.
  • Serial separation: use the independent serial port only after electrical interface, protocol, cable, and peer settings agree.
  • Fault isolation: separate a Channel 1A link problem from a serial programming problem before replacing the processor.
  • Battery evidence: record BATT indication and power-off history before assuming the application remains in RAM.
  • EEPROM boundary: verify memory-module catalog and processor Series/Revision before attempting a restore.
  • Controlled return: clear or initialize memory only with an approved project and outputs held in a safe state.
  • Compact 1771 chassis control: execute ladder logic for a PLC-5/11 system within its documented memory and I/O boundaries.
  • Remote I/O scanner or adapter service: assign Channel 1A to the required Remote I/O role and rack-3 topology.
  • DH+ or serial communication: exchange controller data through the documented channel mode and compatible serial interface.
Description
Rack allocation is the defining engineering boundary for 1785-L11B: the official PLC-5 table assigns the remote-chassis allocation to rack 3 within the processor's addresses 0 through 3. This makes the saved octal map and physical adapter switches central evidence during a compact 1771 system recovery.

Within that topology, 1785-L11B provides 8 K words of user memory and supports 512 I/O in any mix, or 384 inputs with 384 outputs in complementary mode. One combined channel is assigned to DH+ or Remote I/O duty, while the independent serial port supports the documented electrical interfaces.

Installation places 1785-L11B in the left-most slot of a supported 1771 chassis. A usable restoration record connects the exact catalog and Series/Revision to the channel mode, battery history, compatible memory module, serial configuration, and validated application rather than relying on chassis appearance alone.
Revisions

Revision Part #

Also known as

1785-L11B Series A
1785-L11B Series A, Revision R.2
1785-L11B Series C
1785-L11B Series C, Revision U.2
1785-L11B Series D
1785-L11B Series D, Revision L.2
1785-L11B Series E
1785-L11B Series E, Revision K.2
Alternative Names
Allen-Bradley 1785-L11B Rockwell Automation 1785-L11B AB 1785-L11B 1785L11B 1785 L11B PLC-5/11 Enhanced Programmable Controller 1785-L11B
Technical notes
Do not accept a 1785-L11B remote-I/O restoration from total chassis count alone. The documented allocation places the remote chassis at rack 3, so reconcile the octal rack map, configured network role, adapter switches, and archived project before enabling outputs; stop if the physical chassis assignment and project database disagree.
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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 1785-L11B show a red processor indication after a long power outage?
Hold outputs safe, inspect BATT history, determine whether RAM is empty or faulted, locate the validated project or compatible EEPROM, and initialize or restore only after catalog and application identity are confirmed.
How should the remote rack be assigned when 1785-L11B uses its five-chassis maximum?
Map octal racks 0…3, reserve rack 3 for the documented remote allocation, compare adapter switches with the project, and stop commissioning if the remote chassis appears under another rack address.
What should be checked when 1785-L11B communicates on serial but not on Channel 1A?
Confirm whether Channel 1A is configured for DH+ or Remote I/O, inspect the correct cable and terminators, verify node or rack addressing, and correlate the channel indicator before editing the independent serial configuration.
Why can a larger PLC-5 project fail to restore into 1785-L11B even when the communication path is healthy?
Compare the archive memory footprint, I/O map, controller catalog, file allocation, and EEPROM capacity with the 8 K-word target; reject the download if it belongs to a larger processor.
Can 1785-L11B exchange data with any RS-232 device after the connector is adapted?
No. Verify the electrical interface, DF1 or ASCII role, baud, parity, duplex, cable pinout, addressing, and peer behavior with a controlled transaction before production use.
Which records should a buyer require before sourcing 1785-L11B?
Request full catalog and Series/Revision images, channel-face and battery evidence, EEPROM catalog, rack-3 map, project checksum, condition, quantity, and destination; approve only when the record matches the installed PLC-5/11 role.

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