Allen-Bradley 1794-L34
Allen-Bradley 1794-L34
Allen-Bradley 1794-L34
Allen-Bradley 1794-L34
Allen-Bradley 1794-L34
Allen-Bradley 1794-L34
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    Discontinued

1794-L34

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Allen-Bradley 1794-L34 is a 512 KB FlexLogix controller for local and extended-local FLEX I/O with optional communication daughtercards and an RS-232 port.
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Technical specifications for 1794-L34

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-L34
  • Product Family:
    Flex I/O
  • Product Type:
    FlexLogix 5434 Controller
  • Stock:
    1
  • Controller Platform:
    FlexLogix 5434
  • User Memory:
    512 KB
  • Nominal Input Voltage:
    24 V DC
  • Input Voltage Range:
    19.2…31.2 V DC
  • Maximum Input Current:
    1.33 A at 19.2 V DC; 0.85 A at 24 V DC
  • Maximum Power Dissipation:
    25.5 W at 19.2 V DC; 20.4 W at 24 V DC
  • FLEXBUS Current Output:
    653 mA maximum at 5.1 V DC
  • Communication Expansion:
    Up to two communication daughtercards
  • Serial Interface:
    RS-232
  • Mounting:
    35 × 7.5 mm steel DIN rail on a common conductive surface
  • Dimensions:
    19.95 × 12.2 × 10.46 cm
  • Weight:
    0.75 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 Controller Memory Communication Cards I/O Architecture Application
  • FlexLogix 5434 control for distributed FLEX I/O architectures
  • Provides 512 KB of user memory for the Logix project and controller data
  • Supports modular communication cards and operates from a nominal 24 V DC supply

1794-L34 places a Logix controller and configurable network interfaces directly beside FLEX I/O on conductive DIN rail.

Its modular communication-card arrangement lets the system architecture be defined independently from the base controller catalog number.

A successful replacement depends on restoring the original firmware-compatible project, daughtercards, power arrangement, I/O banks, and extended-local adapter path.

Availability, condition, price, and shipping time for 1794-L34 are confirmed during quotation.

Allen-Bradley 1794-L34 FlexLogix 5434 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.

  • The 1794-L34 provides 512 KB of user memory for the FlexLogix application.
  • Firmware must be upgraded to the major revision required by the RSLogix 5000 project.
  • The project backup should include controller properties, tags, tasks, and I/O configuration.
  • Two optional daughtercard positions support the selected industrial networks.
  • Record each daughtercard catalog number, slot, node address, and connector before removal.
  • The base controller catalog number does not identify the installed daughtercard combination.
  • Local FLEX I/O and extended-local I/O must follow the documented bank arrangement.
  • Mount all related DIN rails on a common conductive surface for electromagnetic performance.
  • Restore power segmentation, module order, interconnect cables, and end components exactly.
  • FlexLogix machine control with local FLEX I/O modules mounted beside the controller.
  • Control systems using extended-local FLEX I/O through a documented 1794-FLA adapter arrangement.
  • Networked Logix applications using supported communication daughtercards and the built-in RS-232 interface.
Description
1794-L34 is an Allen-Bradley FlexLogix 5434 controller with 512 KB of user memory for modular control applications using FLEX I/O.

The controller supports local and extended-local I/O arrangements, one RS-232 interface, and up to two optional communication daughtercards; Rockwell Automation documentation identifies both Series A and Series B hardware.

Before replacement, preserve the project and controller properties, then verify the installed hardware series, firmware, daughtercards, I/O layout, battery, power supply, DIN-rail grounding, and extended-local cabling.
Revisions

Revision Part #

Also known as

1794-L34 Ser A
1794-L34/A, Series A, Rev A
1794-L34 Ser B
1794-L34/B, Series B, Rev B
Alternative Names
1794-L34 1794L34 1794 L34 Allen-Bradley 1794-L34 Allen Bradley 1794-L34 AB 1794-L34 Rockwell Automation 1794-L34
Technical notes
Before replacing 1794-L34, match the installed Series A or Series B hardware, firmware, communication cards, power, grounding, FLEX I/O layout, and saved 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.
What must be backed up before replacing Allen-Bradley 1794-L34?
Save the complete Logix project, controller properties, firmware level, communication-card configuration, I/O tree, serial settings, produced and consumed tags, and any motion or network dependencies.
Can Allen-Bradley 1794-L34 be ordered without identifying its communication daughtercards?
The base controller and its optional daughtercards are separate configuration elements. Identify both installed cards, their connectors, network addresses, and project profiles before sourcing a replacement.
How should Allen-Bradley 1794-L34 firmware be matched to the saved project?
The controller firmware major revision must match the RSLogix 5000 project environment. Record the working firmware and software revision before removing the controller.
What power arrangement should be checked for Allen-Bradley 1794-L34?
Verify the 24 V DC source, current capacity, grounding, shutdown behavior, battery, and any special requirements of the selected supply; the legacy 1794-PS1 requires the documented resistor arrangement.
Why is the DIN-rail installation important for Allen-Bradley 1794-L34?
The controller and local or extended-local components must share the documented conductive mounting surface for proper grounding and electromagnetic performance, with DIN-rail locks where required.
Can Allen-Bradley 1794-L34 be replaced while keeping the existing FLEX I/O layout?
Yes only after confirming the exact local and extended-local bank arrangement, power segmentation, adapter and cable types, module order, and the saved I/O configuration.
What is the greatest migration risk for Allen-Bradley 1794-L34?
Selecting a newer controller solely by memory size can overlook daughtercards, network behavior, firmware, scan timing, I/O architecture, serial devices, and application features that require engineering changes.

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