Allen-Bradley 1791-8BR Block I/O Module

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

Key Technical Specifications

• Brand: Allen-Bradley
• Model: 1791-8BR
• Series: 1791 Block I/O
• Module Type: Combination Input / Relay Output Module
• Input Channels: 8 Points, 24VDC Sinking
• Output Channels: 8 Points, Dry Contact (Form A) Relay
• Input Voltage Range: 10-30 VDC
• Relay Contact Rating: 1A Resistive Max. (20-30VDC / 20-132VAC)
• Module Power Supply: 19.2–30 VDC External
• Communication Protocol: Remote I/O (RIO)
• Weight: 1.00 lb (0.45 kg)

Input & Output Characteristics

• The eight DC inputs require an on-state voltage between 10-30 VDC to activate.
• Each input draws a maximum of 11 mA at 30V when on.
• The output channels feature Normally Open (N.O.) dry contacts.
• Relay outputs are highly flexible, switching both AC and DC loads.
• The maximum resistive load rating is 1A at 20-30 VDC or 20-132 VAC.
• Always use external fusing for output circuits, as the module lacks internal load protection.

Installation & Wiring

• Mount the module vertically or horizontally on a standard DIN rail.
• Connect the 24VDC external power to terminals +24 (1) and RET +24 (3).
• Terminal GND (2) is for chassis ground connection.
• Use terminals BLU (6), SHD (7), and CLR (8) for the RIO network communication cable.
• For signal wiring, use a maximum of 14 AWG stranded wire.

Frequently Asked Questions (FAQ)

• Q: Is the 1791-8BR a relay output module?
  A: Yes. It has 8 dry contact relay outputs that can switch both AC and DC voltages.
• Q: What controllers is this module compatible with?
  A: It is compatible with Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 controllers via RIO.
• Q: Does the module include internal fuses for protection?
  A: No. You must install external fuses to protect the output circuits and connected loads.
• Q: What is the switching capacity of the relay contacts?
  A: The relay contacts are rated for a maximum of 1 Amp resistive load.
• Q: Do you have the 1791-8BR in stock?
  A: Yes, we maintain stock for quick shipment, typically within 5 business days.
• Q: What is your return policy?
  A: We offer a straightforward 30-day return policy for all products.

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