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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
1791-0A16 120V ac BLOCK I/O Allen-Bradley AB with 16 Outputs per Block. New and Used in Stock!
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1791-0A32 120V ac BLOCK I/O Allen-Bradley AB with 32 Outputs per Block. New and Used in Stock!
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1791-0B16 24V dc BLOCK I/O Allen-Bradley AB with 16 Outputs per Block. New and Used in Stock!
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1791-0B32 24V dc BLOCK I/O Allen-Bradley AB with 32 Outputs per Block. New and Used in Stock!
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1791-16A0 120V ac BLOCK I/O Allen-Bradley AB with 16 Inputs per Block. New and Used in Stock!
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1791-16AC 120V 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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1791-16B0 24V 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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1791-16BC 24V 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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1791-24A8 120V 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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1791-24AR 120V 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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1791-24B8 24V 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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1791-24BR 24V 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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1791-32A0 120V ac BLOCK I/O Allen-Bradley AB with 32 Inputs per Block. New and Used in Stock!
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1791-32B0 24V dc BLOCK I/O Allen-Bradley AB with 32 Inputs per Block. New and Used in Stock!
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1791-8AC 120V ac 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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1791-8AR 120V ac 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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1791-8BC 24V 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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1791-8BR 24V 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-IOBB The 1791-IOBB module block is an Allen-Bradley I/O module block. It has a power rating of 24 Volts DC with 10 i...
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1791-IOBW 24V 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-IOBX 24V 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-IOVW 24V 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-IOVX 24V dc BLOCK I/O Allen-Bradley AB with 64 Sourcing Inputs per Block and 64 Sinking Outputs per Block. New and Used in Sto...
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1791-N4C2 The 1791-N4C2 module is an Allen-Bradley Block I/O module. The Block I/O module features 6 analog I/O poin...
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1791-N4V2 The 1791-N4V2 module is an Allen-Bradley Block I/O module. The Block I/O module features 4 selectable inpu...
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1791-NDC The 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-NDV The 1791-NDV module is an Allen-Bradley I/O block module with up to 6 channels. The unit has 4 input channels and 2 output...
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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 Aut...
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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 diffe...
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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 ...
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1791-OB32 The 1791-OB32 module is a FLEX I/O digital DC output module that has been designed and distributed by Allen-Bradley. ...
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1791 Block I/O Description Stock Level

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