Allen Bradley 1791-IOBW Block I/O Module

Applications

• Distributed remote I/O in legacy PLC systems
Widely used in PLC-2, PLC-3, PLC-5, and SLC 500 architectures to connect field devices through Remote I/O networks.

• Factory automation signal aggregation
Collects and manages multiple digital input/output signals from sensors, actuators, and machine devices in a single block.

• Industrial machine control and interlocking systems
Used in production lines where centralized I/O blocks simplify wiring and improve system organization.

• Process plant control and monitoring
Supports stable data exchange in continuous process industries such as chemicals, water treatment, and utilities.

• Retrofit and expansion of existing automation systems
Ideal for extending legacy systems without replacing entire control architectures.

Key Advantages

• High-density I/O integration in a compact block design
Combines multiple input and output channels in a single industrial module, reducing cabinet complexity.

• Built-in Remote I/O communication capability
Enables direct integration with Rockwell PLC systems via Remote I/O architecture.

• Strong compatibility with legacy Allen-Bradley controllers
Supports long lifecycle industrial systems where PLC-5 and SLC platforms are still in operation.

• Robust industrial-grade construction
Designed to operate reliably in harsh environments with electrical noise and temperature variation.

• Efficient wiring and reduced installation complexity
Block-level design minimizes point-to-point wiring compared to traditional I/O racks.

Technical FAQs

Q1: Which PLC systems support the 1791-IOBW?
It is compatible with PLC-2, PLC-3, PLC-5, and SLC 500 systems using Remote I/O.

Q2: How many input and output channels does it provide?
It typically provides 32 digital inputs and 32 digital outputs in a block configuration.

Q3: What communication method does it use?
It uses Allen-Bradley Remote I/O communication protocol.

Q4: Is it suitable for modern Ethernet-based systems?
No, it is designed for legacy Remote I/O networks.

Q5: Can it operate in harsh industrial environments?
Yes, it is built for industrial temperature ranges and noise resistance.

Q6: Does it require a separate power supply?
Yes, it operates on an external 24V DC power supply.

Q7: Can it be used for analog signals?
No, it is designed primarily for digital I/O applications.

Q8: Is it still widely used today?
It is mainly used in existing legacy installations rather than new systems.

Q9: Does it support redundancy features?
Redundancy depends on the overall system architecture, not the module itself.

Q10: Can it be hot-swapped?
No, installation/removal should follow controlled shutdown procedures.