1791-32A0 Allen-Bradley 32 Input 120VAC Block I/O Module

1791-32A0 Allen-Bradley 32-Point 120VAC Block I/O Overview

• Input Configuration: The module features thirty-two (32) 120VAC input channels, arranged into four isolated groups of eight channels each.
• Electrical Ratings: It operates with an on-state voltage range of 79-132VAC at 47-63 Hz. The nominal input current requirement is 11.0 mA per channel.
• Precise Specifications: Each channel exhibits an on-state current of 12.3mA max at 132V and an off-state voltage of 35V max, ensuring accurate signal detection.
• Performance Metrics: The input impedance measures 15KΩ at 60 Hz. Signal delays are typically 1.0 ms for off-to-on transitions and a maximum of 26 ms for on-to-off transitions.
• Communication & Isolation: A single RIO port facilitates network connectivity. It provides robust isolation of 1250VAC for group-to-group and group-to-logic, plus 500VAC for power supply to RIO.
• Power Requirements: The module requires an external supply of 85-132VAC at 47-63 Hz, drawing 150 mA of current.
• Thermal Management: It dissipates a maximum of 13.62 Watts (46.44 BTU/hr), necessitating adequate airflow within the control cabinet.
• Environmental Tolerances: Its operating temperature range spans 0 to 60 degrees Celsius. Storage tolerance extends from -40 to 85 degrees Celsius with 5-95% non-condensing humidity.

Frequently Asked Questions (FAQ)

• Q: What programmable controllers is the 1791-32A0 compatible with?
  A: This module works with PLC-2, PLC-3, PLC-5 family, and SLC 5/02 controllers that support the RIO protocol.
• Q: How do I interpret the off-state and on-state current specifications?
  A: The off-state current is a minimum of 2.3mA at 60 Hz. The on-state current requires a minimum of 5mA at 79V and maxes at 12.3mA at 132V, 60 Hz.
• Q: What is the purpose of the group isolation on the 1791-32A0?
  A: Group isolation (1250VAC) separates the four input groups electrically. This protects the logic and other groups from voltage transients on one group.
• Q: Can I use this module in a high-vibration environment?
  A: Yes, its design supports panel or DIN rail mounting, making it suitable for typical industrial vibration levels when properly secured.
• Q: Does the module support half-cycle dropout for input signals?
  A: Yes, the maximum 26 ms on-to-off delay allows the module to accommodate a half-cycle dropout without losing the signal state.

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