AB 1785-V80B
AB 1785-V80B
AB 1785-V80B
AB 1785-V80B
AB 1785-V80B
AB 1785-V80B
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1785-V80B

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Built for the largest PLC-5/VME configuration in Rockwell Automation’s comparison table, Allen-Bradley 1785-V80B provides 100K words, addresses up to 2,944 I/O points and supports as many as 23 remote-I/O racks.
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Technical specifications for 1785-V80B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-V80B
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5/V80 VMEbus Processor
  • Stock:
    1
  • User Memory:
    100K words maximum
  • Total I/O Capacity:
    2,944 points in any mix
  • Complementary I/O Capacity:
    2,944 inputs and 2,944 outputs
  • Analog I/O Capacity:
    2,944 points maximum
  • DH+ or Remote I/O Ports:
    4
  • Remote I/O Racks:
    23 maximum
  • Remote I/O Chassis:
    92 maximum
  • RS-232 Ports:
    1
  • Backplane Current:
    3.3 A maximum; 2.7 A typical
  • Dimensions:
    4.1 × 18.8 × 26.2 cm
  • RIO Transmission Rate:
    57.6 / 115.2 / 230 kbit/s
  • Program Scan Time:
    0.5 ms per K word (bit logic); 2 ms per K word typical
  • 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 Fit I/O Planning Network Recovery Application
  • 100K-word PLC-5/V80 controller with a 32K-word limit per data-table file
  • Addresses up to 2,944 I/O points across as many as 23 remote-I/O racks
  • Supports four DH+/remote-I/O ports, RS-232 and as many as 16 MCPs

1785-V80B is the high-capacity controller in the documented PLC-5/VME comparison table.

Its 92-chassis remote-I/O ceiling and VME communication functions suit installations whose rack map and memory demand exceed the smaller V40 configuration.

Commissioning must verify the per-file memory limit, all four channel roles, remote-rack assignments and the host-side VME address allocation.

Availability, condition, price, and shipping time for 1785-V80B are confirmed during quotation.

Allen-Bradley 1785-V80B PLC-5/V80 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.

  • Use the 1785-V80B VME status file to monitor host-interface information
  • Account for A16 registers and the configured A24 general-purpose memory window
  • Verify VME message transfers, interrupt handling and host access before production startup
  • Keep the restored design within 2,944 I/O points and 23 remote-I/O racks
  • Map no more than 92 remote chassis across the four configurable network ports
  • Check the 32K-word limit separately for every required data-table file
  • Restore the documented 57.6, 115.2 or 230 kbit/s rate for every remote-I/O channel
  • Confirm that no project dependency assumes an extended-local I/O port
  • Validate RS-232, DH+, remote-I/O and VME-host communication as separate paths
  • High-capacity PLC-5/VME systems requiring up to 100K words of controller memory
  • Remote-I/O architectures approaching 2,944 points, 23 racks or 92 chassis
  • VME-host applications using PLC-5 status files, message transfers and interrupts
Description
Allen-Bradley 1785-V80B is the 100K-word PLC-5/VME controller and supports as many as 2,944 I/O points, 23 remote-I/O racks and 92 remote chassis.

The controller retains four configurable DH+ or remote-I/O ports and an RS-232 channel, while its VME status file and extended message functions support exchanges with the VME host.

Each data-table file remains limited to 32K words, and the catalog provides no extended-local I/O port; capacity, file layout and network topology must therefore be checked separately during replacement.
Alternative Names
1785-V80B Allen-Bradley 1785-V80B Rockwell Automation 1785-V80B PLC-5/V80 1785-V80B Allen-Bradley PLC-5/V80 1785-V80B PLC-5 VME 1785-V80B
Technical notes
1785-V80B provides 100K words but limits each data-table file to 32K words; replacement must preserve the 23-rack/92-chassis remote-I/O design, four channel roles, RS-232 settings, VME allocation, firmware and saved 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.
Can an existing PLC-5/VME project be restored unchanged to Allen-Bradley 1785-V80B?
Only after confirming that the saved project, firmware, VME mappings, rack plan, channel roles, and serial settings match the replacement processor and installed chassis.
What must be preserved before replacing Allen-Bradley 1785-V80B?
Save the controller project, I/O rack plan, channel assignments, node addresses, serial configuration, firmware information, and any VME application dependencies.
Can Allen-Bradley 1785-V80B replace a 1785-V40L without engineering review?
No. Their memory, I/O architecture, port configuration, and extended-local capabilities differ, so the controller design and software must be reviewed.
How should the four network ports on Allen-Bradley 1785-V80B be checked?
Record whether each channel is used for Data Highway Plus or remote I/O and preserve baud rate, rack, node, scanner, and adapter settings.
What should be checked when Allen-Bradley 1785-V80B does not enter Run mode after replacement?
Verify VMEbus seating, processor mode, memory image, firmware compatibility, rack configuration, channel settings, and whether the saved application was restored correctly.
Does Allen-Bradley 1785-V80B support extended-local I/O?
No. The official PLC-5/VME specification table lists no extended-local I/O ports for 1785-V80B.
Why can remote racks remain offline after Allen-Bradley 1785-V80B starts successfully?
Check each DH+ or remote-I/O channel role, rack numbers, baud rates, scanner or adapter settings, cabling, termination, and whether the restored project matches the field topology.