1791-32B0 | Allen-Bradley 1791 Series | 24V DC Input Block

1791-32B0 Allen-Bradley 24V DC 32-Point Input Block Overview

• Input Configuration: The module features thirty-two (32) 24V DC input channels, logically arranged in four isolated groups of eight inputs each.
• DC Electrical Ratings: It operates with an on-state voltage range of 10-30 Volts DC. The nominal input on-state current is 11 mA at 30V DC maximum.
• Precise Switching Specifications: The off-state voltage measures 5V DC maximum, with a minimum off-state current of 1.5 mA. This ensures clear signal differentiation.
• Performance Characteristics: The module presents a maximum input impedance of 3.4KΩ. Its design ensures compatibility with various 1771 output modules and relay types.
• Isolation & Protection: It provides robust isolation of 500 Volts AC for power supply to RIO, I/O group-to-group, and I/O group-to-logic interfaces.
• Power Requirements: The 1791-32B0 requires an external power supply of 19.2-30 Volts DC, drawing a current of 300 mA.
• Thermal Management: It dissipates a maximum of 16.3 Watts (55.6 BTU/hr). Proper ventilation in the control cabinet ensures optimal thermal performance.
• Environmental Tolerance: The module operates reliably within an ambient temperature range of 0 to 60 degrees Celsius.

Frequently Asked Questions (FAQ)

• Q: What controllers are compatible with the 1791-32B0?
  A: This module connects seamlessly with PLC-2, PLC-3, PLC-5 family, PLC-5/250, and SLC 5/02 modular controllers via RIO.
• Q: How do I ensure compatibility with a 1771 series output module?
  A: Verify that the output module's off-state leakage current is less than the 1791-32B0's minimum off-state current (1.5 mA).
• Q: What are the on-state and off-state voltage requirements?
  A: The on-state voltage range is 10-30V DC. The module detects an off-state condition when the voltage falls to 5V DC maximum.
• Q: Can this module drive loads like contactors directly?
  A: No, it is an input module only. It senses device states. It is compatible with pure coil 100-A45 contactors and Type F, P, and PH relays for sensing.
• Q: What wire gauge should I use for the DC inputs?
  A: Use 14 AWG stranded wire with a maximum insulation thickness of 3/64 inches for reliable input and power connections.

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