CompactBlock I/O 1791D Repair

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

We offer extensive repairs for your CompactBlock I/O 1791D. We keep many spare parts in stock so that we can repair your CompactBlock I/O 1791D 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 1791D 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 1791D 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 Allen-Bradley CompactBlock I/O 1791D series is a series of 24 Volts DC standalone DeviceNet expansion modules with compact and cost-effective designs that are built to provide easy-to-use, compact, and cost-effective distributed I/O solutions for industrial system control. The compact design of the CompactBlock 1791D I/O modules greatly reduces the need for large safety enclosures and extensive wiring, and they come with single bus cabling designs that help to reduce maintenance. A typical CompactBlock I/O 1791D module comprises a built-in power supply, I/O circuits, and a built-in DeviceNet I/O adapter, and they are compatible with the Allen-Bradley PLC, SoftLogix, and SLC programmable controllers when they are used with DeviceNet scanner modules. The CompactBlock I/O 1791D modules have a 10 to 30 Volts DC power requirement that can accommodate a wider range of applications, and they come with IEC/NEMA Type 1+ inputs that support a wide range of compatible sensors. The module I/O data is easily accessible on the data table of the controller, and the module can be configured by using the RSNetworx for DeviceNet configuration software, which provides easy-to-use interfaces for both off-line and online configuration.


The CompactBlock I/O 1791D series offers digital base modules ranging from 4 to 16-point configuration, and expansion modules with 16 I/O points per module. The CompactBlock I/O 1791D modules act as slave units in master/slave environments, and they support polled, cyclic, or change-of-state configurations. These modules have input filtering and output short-circuit protection capabilities, and they come with diagnostic indicator lights that show device and network status updates. The CompactBlock I/O 1791D modules can be mounted on either a DIN-Rail or on a panel, and they have removable terminal blocks that allow for easy replacement without the need for rewiring. The modules have rotary node address switches and auto-baud detection capabilities that eliminate crashing due to incorrect baud settings. The CompactBlock I/O 1791D modules are CE and c-UL-us certified and they are built for operation within a 0 to 60 degrees Celsius temperature range.

Part Number Description Price Action
1791D-0B16PCompactBlock I/O 1791D Repair Service$99cartAdd To Cart
1791D-0B16PXCompactBlock I/O 1791D Repair Service$98cartAdd To Cart
1791D-0B8PCompactBlock I/O 1791D Repair Service$121cartAdd To Cart
1791D-0V16PCompactBlock I/O 1791D Repair Service$102cartAdd To Cart
1791D-0V16PXCompactBlock I/O 1791D Repair ServiceAskRequest A Quote
1791D-16B0CompactBlock I/O 1791D Repair Service$121cartAdd To Cart
1791D-16B0XCompactBlock I/O 1791D Repair Service$101cartAdd To Cart
1791D-16V0CompactBlock I/O 1791D Repair Service$101cartAdd To Cart
1791D-16V0XCompactBlock I/O 1791D Repair ServiceAskRequest A Quote
1791D-4B0CompactBlock I/O 1791D Repair Service$101cartAdd To Cart
1791D-4B4PCompactBlock I/O 1791D Repair Service$125cartAdd To Cart
1791D-8B8PCompactBlock I/O 1791D Repair Service$135cartAdd To Cart
1791D-8V8PCompactBlock I/O 1791D Repair Service$133cartAdd To Cart
Part Number Description Price Action
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