Overview
The Allen-Bradley 1791-16B0 is a Series B discrete DC input module from the 1791 Block I/O family. Designed to facilitate a wide input voltage range from 10 V to 30 V DC, this module effectively manages up to 16 inputs organized into two groups, each containing eight inputs. A complete 16-point input interface in one small block saves panel space.
Key Features
- Sixteen discrete input channels with sinking or sourcing capability
- On-state current ranging from 2.5 mA to 11 mA, with off-state voltage limited to 5 V DC maximum for low power consumption
- Removable terminal strip for quick connections and easy maintenance
- Status indicators and DIP switches on the front for setup and troubleshooting
- Built-in internal fusing eliminates need for external power fusing
- Can be mounted horizontally or vertically, with vertical mounting recommended
Technical Specifications
- Input Voltage: 24 Volts DC nominal
- Input Channels: 16 discrete DC inputs
- Input Impedance: 3.4 Kilo-ohms (maximum)
- On-State Current: 2.5 mA to 11 mA
- Off-State Voltage: Maximum 5 V DC
- Dimensions: 6.95 x 2.7 x 3.85 inches
- Series: 1791 Block I/O Series B
- Communication: Remote I/O protocol compatible
Typical Applications
Ideal for cost-effective mounting in smaller, less expensive enclosures for applications such as packaging, material handling, and operator interface. Suitable for distributed I/O architecture, machine-mounted sensor interface, and remote plant-floor automation.
Compatibility & Replacements
Compatible With
- Works with PLC-5, SLC, and other classic Allen-Bradley controllers
- Remote I/O scanner modules
- Remote I/O applications with PLC2, PLC3, PLC5, and SLC 5000 product family
- Classic Allen-Bradley automation platforms (no CompactLogix or ControlLogix)
Replaces / Drop-In Replacement For
The 1791-16B0 is a legacy module. Verify compatibility with your system integrator before ordering. For modern systems, CompactBlock I/O (1791R or 1791P series) or EtherNet/IP-based remote I/O may be required replacements.
Works With
- Remote I/O (RIO) protocol networks
- Baud rates from 57.6K up to 230.4K; cable distance up to 10,000 feet at 57.6K, 5,000 feet at 115.2K, and 2,500 feet at 230.4K
- Daisy-chain wiring topology for multi-module installations
- Ladder logic programs on PLC-5 and SLC platforms
