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    Apter Power checks dual-channel assignments, Series/Revision, project archive, and condition before pre-shipment coordination.

1785-L30B

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Two independently assigned DH+/Remote I/O channels let 1785-L30B divide scan-list ownership across an eight-address octal rack plan.
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Technical specifications for 1785-L30B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-L30B
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/30 Enhanced Programmable Controller
  • Stock:
    1
  • Controller family:
    PLC-5/30 Enhanced Programmable Controller
  • Maximum user memory:
    32 K words
  • Total I/O maximum:
    1,024 any mix or 1,024 inputs + 1,024 outputs complementary
  • Communication ports:
    2 DH+/Remote I/O channels and 1 configurable serial port
  • Maximum rack addresses:
    8 rack addresses (0…7)
  • Maximum I/O chassis:
    29 total; 28 remote
  • 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:
    two configurable DH+/Remote I/O channels define the network topology
  • Weight:
    1.45 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 Dual Scan Lists Eight-Rack Map Battery Window Product Applications

Features:

  • Midrange memory: 32 K words with a 1,024-I/O any-mix ceiling
  • Dual configurable channels: two DH+/Remote I/O paths can be assigned independently
  • Expanded chassis scope: eight rack addresses and as many as twenty-nine I/O chassis
1785-L30B expands PLC-5 network planning beyond a single configurable channel while retaining the same 1771 chassis discipline.

Its two-channel architecture is most valuable when each scan list has an explicit rack-address owner and a documented cable and termination route.

Selection should be tied to the 32 K application, octal map, remote chassis inventory, battery and memory-module plan, and the Series/Revision firmware record.
For 1785-L30B, Apter Power can coordinate scan-list documentation checks, quotation, and sourcing support.
Allen-Bradley 1785-L30B PLC-5/30 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.
  • Channel ownership: assign every rack address to exactly one DH+/Remote I/O channel.
  • Mode record: document whether each channel is a scanner, adapter, or DH+ link before project restoration.
  • Independent proof: validate one channel at a time so a cable or terminator fault is not hidden by the healthy link.
  • Address range: build the application and adapter-switch record around octal racks 0…7.
  • Chassis ceiling: keep the design within twenty-nine total and twenty-eight remote chassis.
  • Device boundary: confirm physical devices, baud rate, resistor value, and cable length in addition to logical rack count.
  • Low-battery response: secure a current project and plan replacement promptly when BATT indicates.
  • Power-off risk: account for the shorter high-temperature retention window documented for the PLC-5/30 group.
  • Memory validation: verify EEPROM compatibility and application identity before transferring a stored program.
  • Medium PLC-5 process or machine control: run a 32 K-word application with as many as 1,024 I/O in any mix.
  • Dual Remote I/O network control: distribute supported racks across two independently configured scanner links.
  • DH+ and serial data exchange: combine a selected DH+ channel role with the compatible serial interface.
Description
Two independently configurable control-network paths define 1785-L30B. Each channel can carry DH+ or Remote I/O duty, allowing a validated project to divide scanner, adapter, or peer-network work across separate links while the configurable serial interface remains available for its documented communication role.

The rack plan for 1785-L30B spans octal addresses 0 through 7 and as many as twenty-nine chassis, including twenty-eight remote chassis. Every physical adapter and scan-list entry still needs one channel owner, because the total chassis allowance does not prevent a duplicate rack assignment across the two links.

Application capacity gives 1785-L30B 32 K words of user memory with 1,024 I/O in any mix, or 1,024 inputs plus 1,024 outputs in complementary mode. Acceptance evidence should connect that project identity to both channel configurations, the rack map, battery record, and exact Series/Revision.
Revisions

Revision Part #

Also known as

1785-L30B Series A
1785-L30B Series A, Revision S.2
1785-L30B Series C
1785-L30B Series C, Revision U.2
1785-L30B Series D
1785-L30B Series D, Revision L.2
1785-L30B Series E
1785-L30B Series E, Revision K.2
Alternative Names
Allen-Bradley 1785-L30B Rockwell Automation 1785-L30B AB 1785-L30B 1785L30B 1785 L30B PLC-5/30 Enhanced Programmable Controller 1785-L30B
Technical notes
A 1785-L30B restoration can place the same rack address on both configurable DH+/Remote I/O channels if two scan lists are merged carelessly. Reconcile each octal address to one channel, compare adapter switch settings with the archived project, and keep remote outputs disabled until duplicate ownership has been removed.
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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.
How can duplicate rack ownership be isolated across the two channels of 1785-L30B?
Export both scan lists, mark each octal rack 0…7 against one channel, compare every adapter switch, disconnect one link at a time if safe, and remove any duplicate before enabling outputs.
Why can a project that fits another PLC-5 fail acceptance on 1785-L30B?
Compare controller catalog, 32 K-word memory use, I/O totals, channel modes, rack range, and file references; use the validated PLC-5/30 archive rather than trimming a larger project during commissioning.
What should be verified before adding the twenty-ninth chassis to 1785-L30B?
Confirm the existing twenty-eight remote entries, rack addresses 0…7, per-link device and rack limits, cable rate, resistance, power, and scan-time impact, then stage the addition with outputs inhibited.
How should a low-battery indication on 1785-L30B be handled during a hot plant shutdown?
Secure and verify the current project immediately, record temperature and expected power-off duration, arrange the correct battery, and do not remove chassis power until a recovery path has been tested.
What steps distinguish a serial-peer fault from a channel fault on 1785-L30B?
Test the serial port with known settings and a controlled message, then evaluate each DH+/Remote I/O channel separately by mode, indicator, node or rack address, termination, and scan list.
Which pre-shipment checks identify a genuine 1785-L30B configuration?
Collect catalog and Series/Revision photographs, both network-port assignments, serial-port face, battery state, memory module, project checksum, rack map, condition, quantity, and destination; compare against the installed dual-channel design.