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1785-V40B

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Allen-Bradley 1785-V40B is the 48K-word PLC-5/V40 VME controller for systems with up to 15 remote-I/O racks. Its four configurable DH+ or remote-I/O ports and lack of an extended-local I/O port distinguish it from 1785-V40L.
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Technical specifications for 1785-V40B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-V40B
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/V40 VMEbus Processor
  • Stock:
    1
  • User Memory:
    48K words maximum
  • Total I/O Capacity:
    1,920 points in any mix
  • Complementary I/O Capacity:
    1,920 inputs and 1,920 outputs
  • Analog I/O Capacity:
    1,920 points maximum
  • DH+ or Remote I/O Ports:
    4
  • Remote I/O Racks:
    15 maximum
  • Remote I/O Chassis:
    60 maximum
  • RS-232 Ports:
    1
  • Remote I/O Transmission Rates:
    57.6, 115.2, and 230 kbps
  • Program Scan Time:
    0.5 ms per K word for bit logic; 2 ms per K word typical
  • Backplane Current:
    3.3 A maximum; 2.7 A typical
  • Extended-Local I/O Ports:
    None
  • Maximum Number of MCPs:
    16
  • Dimensions:
    4.1 × 18.8 × 26.2 cm
  • Weight:
    0.67 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 VMEbus Integration Channel Planning Project Recovery Application
  • 48K-word PLC-5/V40 controller for as many as 1,920 I/O points
  • Supports up to 15 remote-I/O racks and 60 remote chassis
  • Four DH+/remote-I/O ports, one RS-232 port and no extended-local I/O port

1785-V40B places PLC-5/V40 control functions in a VMEbus processor assembly.

Its A16 register space and A24 general-purpose memory interface let the VME host exchange status and application data with the controller.

A valid replacement must retain the remote-rack map, four channel assignments, link rates, VME addressing and battery-backed controller image.

Availability, condition, price, and shipping time for 1785-V40B are confirmed during quotation.

Allen-Bradley 1785-V40B PLC-5/V40 VMEbus Processor Manuals, Product Family, 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.

  • Allocate A16 address space for 1785-V40B configuration and status registers
  • Reserve the required A24 space when general-purpose VME memory is used
  • Verify VME interrupt levels, slot position and backplane loading before startup
  • Map no more than 15 remote-I/O racks and 60 remote chassis to 1785-V40B
  • Record whether each of the four channels operates as DH+ or remote I/O
  • Preserve the selected 57.6, 115.2 or 230 kbit/s rate and the separate RS-232 setup
  • Archive the 1785-V40B program and all required data-table files before removal
  • Check the BATT indication and follow the documented 1770-WV/A battery procedure
  • Restore the VME allocation and prove every configured DH+ and remote-I/O path
  • PLC-5/VME systems requiring up to 48K words and 1,920 I/O points
  • Control architectures using as many as 15 remote-I/O racks without extended-local I/O
  • VME-hosted applications exchanging data through PLC-5/VME registers and memory
Description
Allen-Bradley 1785-V40B is the 48K-word PLC-5/VME controller that addresses as many as 1,920 I/O points.

Its VME interface uses A16 space for configuration and status registers and can use A24 space for general-purpose memory, while four independent ports can be assigned to Data Highway Plus or remote I/O.

This catalog has no extended-local I/O port. Replacement therefore depends on the installed VME allocation, 15-rack remote-I/O plan, channel rates, RS-232 settings and recovered PLC-5 application.
Alternative Names
1785-V40B Allen-Bradley 1785-V40B Rockwell Automation 1785-V40B PLC-5/V40 1785-V40B Allen-Bradley PLC-5/V40 1785-V40B PLC-5/40V 1785-V40B PLC-5 VME 1785-V40B
Technical notes
1785-V40B has no extended-local I/O port; replacement must preserve its A16/A24 VME allocation, 15-rack remote-I/O plan, four DH+/remote-I/O channel assignments, RS-232 settings, 57.6/115.2/230 kbit/s rates, and battery-backed PLC-5 project.
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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 I distinguish Allen-Bradley 1785-V40B from 1785-V40L before ordering?
Confirm the full catalog number and installed port arrangement. The 1785-V40B is the PLC-5/V40 with four DH+ or remote-I/O ports, while 1785-V40L adds an extended-local I/O port and is not interchangeable by name alone.
Will a replacement Allen-Bradley 1785-V40B work in any VMEbus rack?
Not automatically. Verify the documented PLC-5/VME hardware environment, slot allocation, backplane power, address mapping, airflow, and application interface before installation.
What should be backed up before removing Allen-Bradley 1785-V40B?
Save the PLC-5 project, data tables, rack map, channel roles, node addresses, serial settings, firmware details, and any VME application dependencies.
Can Allen-Bradley 1785-V40B be replaced directly with 1785-V80B?
No. Memory, I/O capacity, rack limits, and application requirements differ, so conversion requires an engineering review and verified project compatibility.
Why can Allen-Bradley 1785-V40B load a project but leave field I/O inactive?
The restored project may not match the physical rack numbers, channel scanner or adapter roles, baud rates, node addresses, or remote-I/O cabling and termination.
What battery-related checks are important when replacing Allen-Bradley 1785-V40B?
Preserve the controller image before power removal, inspect the battery status indication, and follow the official procedure for the specified 1770-WV/A battery and memory retention.
What should be checked if Allen-Bradley 1785-V40B loses communication after replacement?
Compare all four channel assignments, network rates, rack and node settings, cabling, termination, RS-232 configuration, VMEbus seating, and the restored controller project with the original installation.