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Allen Bradley 1791 Block I/O Repair

Allen Bradley 1791 Block I/O Repair

We offer extensive repairs for your 1791 Block I/O. We keep many spare parts in stock so that we can repair your 1791 Block I/O as efficiently and effectively as possible. Our standard repair lead time is 2-4 weeks. However, we can often repair your unit much faster if necessary. We can repair most issues with your 1791 Block I/O and if for some reason we cannot repair your unit we will do our best to offer a refurbished unit at the repair cost, so that you can get a working unit back as soon as possible!

  • 2 Year DO Supply Warranty
  • Fast repairs at low costs
  • No surprises or up-charges for difficult repairs
  • Standard lead time of 2-4 weeks
  • Extensive quality control and testing
Get a repair quote
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with DO Supply's 2-year warranty.
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Hardware issues & error codes we repair

We repair all of the following hardware issues and error codes with your 1791 Block I/O parts.

  • Bad communication ports
  • Broken selector/key switches
  • Dead batteries/Bad Battery connections
  • Solid or Blinking RED OK Status Light
  • Solid or Blinking RED RUN Status Light
  • Solid or Blinking RED Fault Status Light

Browse 1791 Block I/O Repairs

Browse our catalog of repairable 1791 Block I/O parts to get a quote.

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About 1791 Block I/O

The 1791 block I/O module series by Allen-Bradley is a series of compact, stand-alone, and remote I/O devices with built-in power supplies, programmable controller interfaces, input/output points, and signal conditioning circuitry for complete system control. These modules are compatible with the Allen-Bradley PLC (2, 3, and 5) controllers and the SLC-500 modular controllers, and they are connected either directly to the controllers in the PLC-3 and PLC-5 programmable controller family or they are connected by using compatible scanner modules. The 1791 block I/O modules have DC power requirements with an operating voltage range between 10 and 30 Volts DC, and they require 200 milliamps of current and a 5.5 Amps (for 10 milliseconds) inrush current to power each block. This series features modules with sinking and sourcing inputs and outputs ranging from 8 to 64 connections, and they have removable remote I/O links, input/output connectors, and terminals for external 24 Volts DC power supply that help reduce wiring costs.

The 1791 block I/O modules have dual DIP switches for setting the I/O configurations and addressing rack numbers. These switches also let the users select and adjust the transmission rates, initiate last racks and I/O groups, and select the last state and DH–485 terminator. A DH-485 port is provided in all modules for connecting to SLC controllers, and this network (DH-485) offers a maximum network communication distance of 4,000 feet. A bi-color LED indicator is also provided on every module for providing power, active, communication, and fuse blown statuses. Depending on the application requirements, multiple I/O blocks can be wired in series via the removable connectors, and a termination resistor must be wired on both ends of the wiring series. The 1791 block I/O modules can provide a maximum network distance range of 2000 to 10,000 cable-feet, and an adjustable baud rate from 57.6 Kilo-baud to 230.4 Kilo-baud.