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Allen Bradley 1791 Block I/O 1791-24B8

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1791-24B8

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The Allen-Bradley/Rockwell Automation 1791-24B8 block I/O module from the 1791 Block I/O series has 32 total I/O points. These 32 I/O points include 24 input points and 8 output points. The 1791-24B8 block I/O module is a DC-powered block I/O module. Its output DC voltage range is from 10 to 30 Volts DC and its input DC voltage range is also from 10 to 30 Volts DC. The 1791-24B8 block I/O module can operate at 32 to 140 degrees Fahrenheit and at 5 to 95% non-condensing relative humidity.

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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1791-24B8

ManufacturerAllen Bradley
CategoryPLCs
Product Line1791 Block I/O
Part Number1791-24B8
UPC612598124794
Weight1.75 lbs (0.79 kg)
Voltage24 Volts DC
Inputs per Block24
Input On-state Voltage Range10 to 30 Volts DC
Input On-state Current11mA at 30 Volts max.
Input Off-state Voltage5 Volts DC max.
Input Off-state Current1.5mA min.
Outputs per Block8
Output Voltage Range10 to 30 Volts DC
External Power19.2 to 30 Volts DC
Product Lifecycle Status*Discontinued/Obsolete

* The Allen Bradley 1791-24B8 has been discontinued by the manufacturer, however we specialize in obsolete parts and can likely still supply surplus and/or refurbished replacement 1791-24B8 units instead of migration.

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The Allen-Bradley 1791-24B8 is an I/O module with 24 inputs and 8 outputs. It has 24 inputs in 3 groups of 8 per block and an ON-state input rating of 10 to 30 Volts DC voltage and a 2.5 milliamps minimum input current at 11 Volts which maxes out at 11 milliamps at 30 Volts DC. It has a maximum ON-state input voltage of 5 Volts DC at 1.5 milliamps and an input impedance of 3.4. The 1791-24B8 has an input signal delay of 1 millisecond ON, 5 milliseconds OFF (fast), and 1 millisecond ON and 18 milliseconds OFF (slow).

The 1791-24B8 has an output rating of 500 milliamps/1Amps at 30 to 60 degrees Celsius with a vertical mounting and 250 to 500 milliamps at 30 to 60 degrees Celsius with a horizontal mounting. It has a current that surges at 3 Amps for 50 seconds that keeps recurring after 2 seconds. The 1791-24B8 has an output OFF-state current of 1 milliamps at a drop voltage of 1 Volts and 0.5 milliamps of current leakage. It has an external power supply with internal protection which supplies voltage in the range between 19.2 and 30 Volts DC at a current of 300 milliamps. The 1791-24B8 has a maximum thermal dissipation of 58.1 BTU/hour and a maximum power dissipation of 17.1 Watts. It has an operational temperature range between 0 and 60 degrees Celsius (32 and 140 degrees Fahrenheit) at a relative humidity of 5 to 95% non-condensing. The 1791-24B8 measures 176.5 millimeters x 68.8 millimeters x 98 millimeters (6.95 inches x 2.7 inches x 3.85 inches) and it weighs 1.02 kilograms (2.25 pounds).

Revision Part #Also known as
1791-24B8 Ser A1791-24B8/A, Series A, Rev A
1791-24B8 Ser B1791-24B8/B, Series B, Rev B
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