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    Apter Power reviews high-capacity rack maps, file boundaries, Series/Revision, project evidence, and condition before quotation.

1785-L60B

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The largest rack and memory scope in this batch belongs to 1785-L60B, which combines four configurable network channels with separate program- and data-file limits.
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Technical specifications for 1785-L60B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L60B
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/60 Enhanced Programmable Controller
  • Stock:
    1
  • Controller family:
    PLC-5/60 Enhanced Programmable Controller
  • Maximum user memory:
    64 K words
  • Total I/O maximum:
    3,072 any mix or 3,072 inputs + 3,072 outputs complementary
  • Communication ports:
    4 DH+/Remote I/O channels and 1 configurable serial port
  • Maximum rack addresses:
    24 rack addresses (0…27 octal)
  • Maximum I/O chassis:
    93 total; 92 remote
  • Backplane current:
    3.3 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:
    56 K-word program-file and 32 K-word data-table-file limits; Series A Revision B needs a zero Global Status Flag before an EEPROM write
  • 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 Octal Rack Estate File Allocation High-Capacity Recovery Product Applications

Features:

  • Largest model in this batch: 64 K-word memory and 3,072 I/O in any mix
  • Broad rack scope: twenty-four octal addresses and ninety-three total chassis
  • File and EEPROM controls: separate file ceilings plus a Series A Revision B write safeguard
1785-L60B supports extensive PLC-5 installations that need four network channels and a larger rack-address plan.

Its engineering boundary lies inside the 64 K total: program and data-table files have different maximum sizes that must survive edits and migration work.

Selection and recovery should join file allocation, channel ownership, rack scans, battery state, EEPROM prerequisites, and exact Series/Revision evidence.
For 1785-L60B, Apter Power can coordinate file-boundary documentation checks, quotation, and sourcing support.
Allen-Bradley 1785-L60B PLC-5/60 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.
  • Address range: maintain an authoritative octal map for racks 0…27 across all four channels.
  • Chassis scope: remain within ninety-three total and ninety-two remote chassis while checking per-link physical limits separately.
  • Collision prevention: compare every adapter switch and scan-list entry before reusing a replacement processor.
  • Program files: keep each file within the documented 56 K-word maximum.
  • Data tables: keep each file within the separate 32 K-word ceiling even when total controller memory remains available.
  • Archive proof: inspect file sizes, indirect addresses, and memory usage before accepting a converted or expanded project.
  • Channel staging: commission and observe the four network links individually before enabling all remote outputs.
  • Battery response: secure the validated archive and act on BATT indication before a long power-off interval.
  • EEPROM gate: apply the Series A Revision B Global Status Flag rule and verify stored-image identity after writing.
  • High-capacity 1771 Remote I/O control: operate a large rack estate through four configurable scanner channels.
  • Large PLC-5 program execution: organize a 64 K-word application within the published program- and data-file limits.
  • DH+ and serial system integration: allocate supported channels to peer, programming, I/O, or compatible serial duties.
Description
The broadest rack scope in this batch belongs to 1785-L60B: octal addresses 0 through 27 can cover ninety-three total chassis, including ninety-two remote chassis. Four configurable DH+ or Remote I/O channels let the archived application divide that estate into separately owned and serviceable network links.

With 64 K words of user memory, 1785-L60B supports 3,072 I/O in any mix, or 3,072 inputs plus 3,072 outputs in complementary mode. Project acceptance must also preserve its internal allocation rules, because the total memory figure does not remove the different limits applied to program and data-table files.

Recovery planning for 1785-L60B connects the four scan lists, complete rack register, battery record, serial settings, compatible memory module, and exact Series/Revision. That combined record allows a large installed base to stage individual links and verify the stored application without treating every remote chassis as one undifferentiated network.
Revisions

Revision Part #

Also known as

1785-L60B Series B
1785-L60B Series B, Revision S.2
1785-L60B Series C
1785-L60B Series C, Revision U.2
1785-L60B Series D
1785-L60B Series D, Revision L.2
1785-L60B Series E
1785-L60B Series E, Revision K.2
Alternative Names
Allen-Bradley 1785-L60B Rockwell Automation 1785-L60B AB 1785-L60B 1785L60B 1785 L60B PLC-5/60 Enhanced Programmable Controller 1785-L60B
Technical notes
Total memory does not remove the internal file ceilings on 1785-L60B. During project growth or migration, keep each program file within 56 K words and each data-table file within 32 K words; compare the edited project with those separate limits and stop the download if either file exceeds its documented boundary.
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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-L60B reject a single oversized program file even when total memory is available?
Measure the file itself, keep program files within 56 K words and data-table files within 32 K words, inspect indirect references, and test any reorganization offline before downloading.
What EEPROM precaution applies to a Series A Revision B 1785-L60B?
Back up the current application, set the Global Status Flag file to zero, verify memory-module compatibility and the required program mode, then confirm the written image before relying on it for recovery.
How should ninety-two remote chassis be reconciled for 1785-L60B?
Maintain one octal rack-and-chassis register for addresses 0…27, assign every rack to exactly one of four channels, compare all adapter switches and scan lists, and verify per-link device limits before enabling the estate.
Why can the longest Remote I/O branch on 1785-L60B fail after increasing baud rate?
Confirm all devices share the new rate, measure trunk and drop lengths, verify resistor selection and physical-device count, inspect the affected channel separately, and return to a supported topology before production.
What should operations do when BATT lights on 1785-L60B during high-temperature service?
Create and verify a current offline archive, assess the remaining powered and unpowered interval against the published warning window, arrange the correct battery, and plan replacement without risking uncontrolled memory loss.
How can procurement keep revision notation separate from 1785-L60B?
Keep the core catalog as the Product Model and record /C only as verified Series/Revision evidence. Require catalog, Series/Revision, four-channel face, memory and battery records, project checksum, condition, quantity, and destination before dispatch.

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