Allen-Bradley 1791-8BC Block I/O Module | 24VDC

Product Overview: Allen-Bradley 1791-8BC Block I/O Module

Key Technical Specifications

• Brand: Allen-Bradley
• Model: 1791-8BC
• Series: Block I/O
• Product Type: Combination Discrete Input/Output Module
• I/O Channels: 16 Points Total (8 Inputs, 8 Outputs)
• Signal Voltage: 24 VDC Nominal (10-30 VDC Range)
• External Power Supply: 19.2–30V DC
• Maximum Current Draw: 300 mA
• Communication Protocol: Remote I/O (RIO)

Detailed Input & Output Characteristics

• The eight DC inputs accept an on-state voltage from 10 to 30 VDC.
• Each input requires a minimum on-state current of 2.5 mA at 10V.
• The maximum input current is 11.0 mA at 30V.
• The eight DC outputs source power within the same 10-30 VDC range.
• Output current rating depends on mounting and temperature.
• For vertical mounting, the rating is 1A at 30°C or 500mA at 60°C.
• For horizontal mounting, the rating is 500mA at 30°C or 250mA at 60°C.

Installation & Communication Setup

• Install the module on a standard DIN rail for a secure and organized panel layout.
• Connect the RIO network using terminals 6 (BLU), 7 (SHD), and 8 (CLR).
• Use a Belden 9463 or similar 3-wire cable for communication.
• You can set the data transmission rate to 57.6K, 115.2K, or 230.4K baud.
• Always install a terminating resistor at the first and last node of the RIO network.
• Use a 150-ohm resistor for 57.6K/115.2K baud rates.
• Use an 82-ohm resistor for the 230.4K baud rate.
• Connect the terminating resistor across the BLU (6) and CLR (8) terminals.

Frequently Asked Questions (FAQ)

• Q: Is the Allen-Bradley 1791-8BC module new?
  A: Yes, we supply only brand new and original Allen-Bradley products.
• Q: Do you have the 1791-8BC in stock?
  A: Yes, we maintain stock for this model to ensure fast delivery.
• Q: What is the lead time for shipping?
  A: We process orders and ship within 5 business days.
• Q: Which logistics services do you use?
  A: We ship internationally via major carriers like DHL, FedEx, and UPS.
• Q: What is the output current for this module?
  A: The output current varies. It supports up to 1A at 30°C when mounted vertically.
• Q: Does this module support modern controllers?
  A: Yes, it works with CompactLogix and ControlLogix via a Remote I/O adapter.
• Q: What is your return policy?
  A: We offer a 30-day return policy for your peace of mind.

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