Allen-Bradley 1791-16B0 Block I/O Module – 16 DC Inputs

1791‑16B0 Block I/O DC Input Module

Allen‑Bradley 1791‑16B0 is a 16‑point DC Block I/O module. It converts 24V DC input power to processor‑ready levels. Ideal for limit, proximity, selector, float, and pushbutton switches. Built‑in power supply, internal protection, and status LED simplify troubleshooting.

Technical Specifications

• Brand: Allen‑Bradley
• Model: 1791‑16B0
• Series: 1791 Block I/O
• Inputs: 16 DC inputs (sinking/sourcing)
• Voltage: 24V DC (nominal)
• Max Input Impedance: 3.4 kΩ
• Weight: 1.00 lbs (0.45 kg)
• Status Indicators: LED for each input
• Wiring: Removable terminal strip (2 captive screws)

Compatible Controllers

• PLC‑2, PLC‑3, PLC‑5/250, PLC‑5, and SLC families.
• Direct interface via 1791 Block I/O architecture.

Installation & Configuration

• Removable terminal strip for quick wiring changes.
• Switch assemblies behind front cover set last state, chassis, and rack number.
• Built‑in power supply with internal overcurrent protection.
• Programmable controller user interface for easy navigation.

Typical Applications

• Discrete input sensing in packaging lines.
• Position monitoring with limit/proximity switches.
• Float switch level control in tank systems.
• Selector and pushbutton panels for machine start/stop.

Oiltech Controls’s Insight

• Proven reliability – 1791‑16B0 remains a staple for legacy PLC upgrades.
• Works seamlessly with PLC‑5 and SLC – no adapter needed.
• Internal protection reduces field wiring faults.
• Compact form factor fits tight cabinets.

Frequently Asked Questions (FAQ)

Q1: Can I use this module with 12V DC sensors?
A: No – input is rated for 24V DC nominal. Using lower voltage may cause false triggers.

Q2: How do I set the I/O rack number?
A: Use the switch assembly behind the front cover. Refer to the manual for binary addressing.

Q3: Is the terminal strip hot‑swappable?
A: No – always disconnect power before removing or inserting the terminal strip.

Q4: What cable type is recommended?
A: Use shielded twisted‑pair for input wiring to reduce noise in industrial environments.

Q5: Which PLCs are directly compatible?
A: PLC‑2, PLC‑3, PLC‑5/250, PLC‑5, and SLC. No extra gateway needed.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spares.
• Global shipping via FedEx, UPS, DHL (24‑28 hour dispatch).
• Tested surplus & refurbished options available.
• 12‑month warranty on all modules.
• Every unit receives technical verification before shipment.
• Expert support for obsolete control systems.

Contact: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)

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