COVID-19 UPDATE: As of Thursday, April 9th our services are ✓ fully operational. We remain committed to providing reliable service to our customers. For a detailed summary of the additional safety measures we have in place, read more.

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COVID-19 UPDATE: Additional safety measures in place

The global outbreak of COVID-19 has created unique and unprecedented operational circumstances for organizations across the world. As of Thursday, April 9th, our services are ✓ fully operational. Our team is currently fully ready and capable of fulfilling orders and otherwise carrying out regular operations.

We remain committed to providing reliable service to our customers while doing everything we can to ensure the safety of our customers, partners, and associates. In accordance with recommendations from the World Health Organization (WHO) and the United States Centers for Disease Control (CDC), we have introduced the following special operational procedures to better ensure the health and safety of our customers, partners, and associates:

  • staff are working remotely, where possible;
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  • products are thoroughly cleaned before packaging; and
  • staff working in the office are frequently washing their hands and using sanitizing equipment readily available across our facilities.

We understand that the availability of our products is critical to many organizations and services. As we supply equipment for critical infrastructure services, we do not anticipate a situation where we are unable to continue our regular operation. We will be closely monitoring the situation and keeping our operational status up-to-date here, on our website.

1791 Block I/O

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The 1791 Block I/O series is a series of small I/O devices that each include a power supply, a programmable controller interface, input and output connections, and circuitry. These devices come in small and compact designs. They have been designed and distributed by Allen-Bradley. The Allen-Bradley 1791 Block I/O series devices include 2 different kinds of blocks, and these are the 1791-IOBA block that comes with 8 inputs and 8 outputs, and the 1791-IOBB block that has 10 inputs and 6 outputs. The specifications are the same for both devices. These 2 blocks are compatible with different programmable controllers from the Allen-Bradley PLC-2, PLC-3, PLC-5, and the SLC 500 families of controllers. Physically, these blocks are composed of a DH-485 port, switch assemblies, status indicators, communication and power LEDs, removable remote I/O connectors, and removable input and output connectors.


The Allen-Bradley 1791 Block I/O devices provide all the functions of different equipment in a single terminal. These include the functions of an I/O rack and module, adapter, and a power supply. Both blocks require a 24 Volts DC power supply that has current limiting capabilities. The voltage that is employed must not fall outside the range of 20.5 to 27.6 Volts DC. The Allen-Bradley 1791 Block I/O must be installed in a ventilated area. This must be done to avoid overheating and enable the blocks to have safe operations. A minimum of 2 inches must be left between different blocks and the air temperature between the blocks must not exceed 55 degrees Celsius. The blocks must be mounted horizontally.

1791 Block I/O Description Stock Level
1791-0A16120V ac BLOCK I/O Allen-Bradley AB with 16 Outputs per Block. New and Used in Stock!
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1791-0A32120V ac BLOCK I/O Allen-Bradley AB with 32 Outputs per Block. New and Used in Stock!
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1791-0B1624V dc BLOCK I/O Allen-Bradley AB with 16 Outputs per Block. New and Used in Stock!
In Stock
1791-0B3224V dc BLOCK I/O Allen-Bradley AB with 32 Outputs per Block. New and Used in Stock!
Available Now
1791-16A0120V ac BLOCK I/O Allen-Bradley AB with 16 Inputs per Block. New and Used in Stock!
In Stock
1791-16AC120V ac BLOCK I/O Allen-Bradley AB with 16 Inputs per Block and 16 Outputs per Block. New and Used in Stock!
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1791-16B024V dc BLOCK I/O Allen-Bradley AB with 16 Inputs per Block and Outputs per Block. New and Used in Stock!
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1791-16BC24V dc BLOCK I/O Allen-Bradley AB with 16 Inputs per Block and 16 Outputs per Block. New and Used in Stock!
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1791-24A8120V ac BLOCK I/O Allen-Bradley AB with 24 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
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1791-24AR120V ac BLOCK I/O Allen-Bradley AB with 24 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
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1791-24B824V dc BLOCK I/O Allen-Bradley AB with 24 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
In Stock
1791-24BR24V dc BLOCK I/O Allen-Bradley AB with 24 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
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1791-32A0120V ac BLOCK I/O Allen-Bradley AB with 32 Inputs per Block. New and Used in Stock!
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1791-32B024V dc BLOCK I/O Allen-Bradley AB with 32 Inputs per Block. New and Used in Stock!
Available Now
1791-8AC120V ac BLOCK I/O Allen-Bradley AB with 8 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
In Stock
1791-8AR120V ac BLOCK I/O Allen-Bradley AB with 8 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
In Stock
1791-8BC24V dc BLOCK I/O Allen-Bradley AB with 8 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
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1791-8BR24V dc BLOCK I/O Allen-Bradley AB with 8 Inputs per Block and 8 Outputs per Block. New and Used in Stock!
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1791-IOBW24V dc BLOCK I/O Allen-Bradley AB with 32 Sinking Inputs per Block and 32 Sourcing Outputs per Block. New and Used in Sto...
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1791-IOBX24V dc BLOCK I/O Allen-Bradley AB with 64 Sinking Inputs per Block and 64 Sourcing Outputs per Block. New and Used in Sto...
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1791-IOVW24V dc BLOCK I/O Allen-Bradley AB with 32 Sourcing Inputs per Block and 32 Sinking Outputs per Block. New and Used in Sto...
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1791-IOVX24V dc BLOCK I/O Allen-Bradley AB with 64 Sourcing Inputs per Block and 64 Sinking Outputs per Block. New and Used in Sto...
Available Now
1791-NDCThe Allen-Bradley 1791-NDC Analog Block I/O Module has a 11.52 W max. Power Dissipation and a 5 Hz Input Bandwidth.
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1791-OA16

The Allen-Bradley/Rockwell Automation 1791-OA16 AC Block I/O module that has been developed by Allen-Bradley/Rockwell ...

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1791-OA32

The Allen-Bradley 1791-OA32 block I/O module consists of a discrete block I/O that includes 32 outputs so that di...

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1791-OB16

The Allen-Bradley/Rockwell Automation 1791-OB16 output DC block I/O module is able to connect different devices, but&n...

In Stock
1791-OB32

The 1791-OB32 module is a FLEX I/O digital DC output module that has been designed and distributed by Allen-Bradley.&n...

In Stock
1791 Block I/O Description Stock Level