CompactBlock I/O 1791P Repair

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

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


The Allen-Bradley CompactBlock I/O 1791P modules series is a series of cabinet-mounted, stand-alone Block I/O base modules that communicate via the Profibus link, and these modules are designed to provide cost-effective and easy-to-use distributed I/O solutions for high-performance system control. The CompactBlock I/O 1791P modules have an IP 20 protection rating in a secondary enclosure, and they all support the single bus cabling that helps to reduce maintenance. The CompactBlock I/O 1791P modules have 10 to 30 Volt DC module power requirements that can accommodate a wider range of applications. The CompactBlock I/O 1791P module series comprises 8 to 16-point modules with both sinking and sourcing inputs and outputs. The 24 Volts DC sinking inputs are NEMA Type 3+ compatible, which supports a wide range of compatible sensors, and they have self-protected outputs that provide short-circuit protection. The CompactBlock I/O 1791P modules can connect to the PLCs via the PROFIBUS-DP scanners, and the PROFIBUS-DP scanners provide device-level communication between programmable logic controllers and distributed I/Os.

The CompactBlock I/O 1791P modules can be installed and configured easily by using the Generic Station Description (GSD) files which are database text-description files that show information about PROFIBUS devices to the controllers. The CompactBlock I/O 1791P modules have rotary address switches and auto baud detection capabilities that help to improve network commissioning. These modules have removable terminal blocks which eliminate the need for rewiring the modules after replacement and which also reduce maintenance costs. The CompactBlock I/O 1791P module series supports both panel and DIN Rail mounting, and they can be mounted in either horizontal or vertical configurations. All CompactBlock I/O 1791P modules have indicators that provide diagnostic read information on the modules status, network status, and I/O status. The CompactBlock I/O 1791P modules are c-UL Listed, and CE certified, and they are designed to operate within a 0 to 60 degrees Celsius temperature range.

Part Number Description Price Action
1791P-0B16PCompactBlock I/O 1791P Repair Service$647.87cartAdd To Cart
1791P-16B0CompactBlock I/O 1791P Repair Service$364.84cartAdd To Cart
1791P-4B4PCompactBlock I/O 1791P Repair Service$636.04cartAdd To Cart
1791P-8B8PCompactBlock I/O 1791P Repair Service$633.28cartAdd To Cart
1791P-8V8PCompactBlock I/O 1791P Repair Service$634.92cartAdd To Cart
Part Number Description Price Action
Don't see yours? Give us a call.