CompactBlock I/O 1791R Repair

Allen Bradley PLC CompactBlock I/O 1791R
One Year DO Supply WarrantyOne Year DO Supply Warranty 
'Fast RepairsFast repairs at low costs

We offer extensive repairs for your CompactBlock I/O 1791R. We keep many spare parts in stock so that we can repair your CompactBlock I/O 1791R 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 CompactBlock I/O 1791R 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!

Repair Details

We can repair hardware issues and error codes with your CompactBlock I/O 1791R such as:

  • Processors
    • 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
  • I/O Modules 
    • Bad analog inputs or ouptus
    • Bad digital input or outputs
    • Bad relays (stuck on/off)
    • Incorrect voltages on inputs or outputs
    • Incorrect current on inputs or outputs
  • Communication Modules​​​​​​​
    • DF1, DH-485, DH+, Profibus, Remote I/ (RIO) failures and more!
    • Intermittent communication 
    • Solid RED/Blinkging RED communication lights
    • Devicenet, Ethernet, ControlNet, RS232 ports. 
  • Thermocouple Modules/RTD Modules
    • Missing CJC Jumpers
    • Incorrect readings
  • High Speed Counters
    • ​​​​​​​Failed inputs
  • Power Supplies​​​​​​​
    • Dead power supplies
    • Incorrect voltage
  • Chassis/Racks
    • ​​​​​​​Broken Plastic
    • Poor Connections
    • Bad Slots

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The CompactBlock I/O 1791R modules series is a series of stand-alone CompactBlock remote I/O base modules by Allen-Bradley that communicate and transmit data via the remote I/O link. These modules are the basis for remote I/O node systems and their compact design makes them ideal for applications with limited space and highly distributed I/O block requirements. The CompactBlock I/O 1791R modules are connected to the Allen-Bradley PLC, SLC, or SoftLogix programmable controllers via remote I/O scanner modules, and the data from these modules are easily accessible on the SLCs or SLC programmable controller’s data tables. The CompactBlock I/O 1791R module series comprises only base modules, and each module consists of I/O circuits, removable terminations, and a built-in remote I/O adapter.


The CompactBlock I/O 1791R module series are DC powered devices that require 24 Volts DC power for operation. These modules have DIP switches that can be used to set the rack addresses and desired baud rates, and they all come with removable terminal blocks (RTBs) that allow for easy installation, removal, and replacement procedures without rewiring. The CompactBlock I/O 1791R module series offers remote I/O modules with 4 to 16 input and output points (sinking/sourcing) depending on the application needs. The CompactBlock I/O 1791R modules are designed for Panel or DIN Rail installation, and they have IP 20 rated enclosures. These modules have colored light indicators that indicate the module and COM statuses, and module-to-module connection can be achieved via the use of the Allen-Bradley 1791D-15CMCBL connecting cable. The CompactBlock I/O 1791R module series has an operating temperature range between 0 and 60 degrees Celsius, and they are c-UL-us, CE, and C-TICK certified.

Part Number Description Price Action
1791R-0B16PCompactBlock I/O 1791R Repair Service$98cartAdd To Cart
1791R-16B0CompactBlock I/O 1791R Repair Service$179cartAdd To Cart
1791R-4B4PCompactBlock I/O 1791R Repair Service$121cartAdd To Cart
1791R-8B8PCompactBlock I/O 1791R Repair Service$141cartAdd To Cart
1791R-8V8PCompactBlock I/O 1791R Repair ServiceAskRequest A Quote
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