Category: Industry trends

Product Overview

The Allen-Bradley 1746-ITV16​ is a 16-point, 24V DC digital input module designed for the Allen-Bradley SLC 500 modular programmable controller system. This specific module, with the common hardware revision 1746-ITV16-A, is engineered to interface field devices that provide a “sourcing” DC signal to the PLC. In electrical terms, a sourcing field device (like a PNP proximity sensor) provides a positive voltage (+24V DC) when active. The Allen-Bradley 1746-ITV16​ is configured as a “sinking” input module; it provides a common connection to the DC negative (Common) and “sinks” the current from each active input point to complete the circuit. This module is a critical interface that converts the state of real-world devices—such as pushbuttons, limit switches, proximity sensors, and photoelectric eyes—into a digital logic level (1 or 0) that the SLC 500 processor can read and evaluate within its control program.Occupying a single slot in an SLC 500 chassis (like the 1746-BAS), the 1746-ITV16-A​ provides a high-density, 16-point solution for gathering discrete status information. Its value lies in its robust industrial design, offering reliable signal conditioning and electrical isolation to protect the sensitive backplane and CPU from voltage transients, noise, and wiring errors present in the plant environment. Each input channel is individually isolated and includes filtering to debounce mechanical switch contacts and reject electrical noise, ensuring clean and accurate data for the control logic. The module’s design simplifies wiring with a removable terminal block that accommodates standard wire gauges, and its front panel features LEDs that indicate the status (ON/OFF) of each input point, enabling quick visual diagnostics during operation or troubleshooting. The Allen-Bradley 1746-ITV16​ is a fundamental building block for creating reliable machine control systems, enabling the PLC to safely and accurately monitor the state of a wide array of industrial sensing devices.

Technical Specifications

Product Overview

The ALLEN-BRADLEY 1746-IH16A is a high-voltage digital input module designed for the Allen-Bradley SLC 500 series of modular programmable controllers. This module provides a robust 16-channel interface, specifically configured for sinking input​ operation, capable of accepting a wide range of input voltages. A key distinguishing feature of the ALLEN-BRADLEY 1746-IH16A​ is its ability to accept both AC and DC input signals, with a nominal operating voltage of 120V. This dual compatibility makes it exceptionally versatile for directly interfacing with a broad array of industrial field devices without requiring intermediate interfacing components. Its primary function is to convert the on/off state of high-voltage field devices, such as limit switches, selector switches, pushbuttons, and proximity sensors, into a logic-level signal that the SLC 500 processor can read and process within its control program.Installed into an I/O slot of a compatible 1746 series chassis, such as the 1746-A13B, the ALLEN-BRADLEY 1746-IH16A​ forms a critical link between the high-power control circuit and the low-voltage logic of the PLC. Each of its 16 input points is designed to accept a sinking (NPN) signal; meaning the field device provides a path to common (sinks current) when active. The module itself sources a small sensing current. The wide voltage acceptance range (79-132V AC/DC) ensures reliable operation despite typical line voltage fluctuations. The ALLEN-BRADLEY 1746-IH16A​ is engineered for industrial durability, incorporating features like optical isolation between each input channel and the internal logic circuits. This isolation is critical for protecting the sensitive processor and other modules from voltage transients, noise, and potential ground loops present in the high-voltage field wiring. The deployment of the ALLEN-BRADLEY 1746-IH16A​ is a strategic choice for applications where devices operate directly on 120V control power, simplifying wiring diagrams by eliminating the need for separate 24V DC power supplies for sensors and allowing for direct monitoring of devices like motor contactor auxiliary contacts. It represents a reliable, high-density solution for consolidating high-voltage discrete signals into a centralized SLC 500 control system.

Technical Specifications

Product Overview

The Allen-Bradley 1746-IG16​ is a high-density, 16-channel digital input module designed for the Allen-Bradley SLC 500 modular programmable logic controller (PLC) system. This module serves as a critical interface between the PLC’s central processor and the field devices, providing a reliable means to read the on/off status of sensors, switches, pushbuttons, and other discrete devices. Specifically configured for 24VDC sinking (NPN) input circuits, the Allen-Bradley 1746-IG16​ is engineered to convert the presence or absence of a 24VDC signal at its terminals into a logical 1 or 0 that the SLC 500 processor can utilize in its control program. Each of its 16 channels is individually isolated in groups and features diagnostics like LED status indicators, making it a fundamental component for machine control, process monitoring, and safety interlocking in a wide range of industrial automation applications.Installed into any available I/O slot of an SLC 500 chassis (such as the 1746-A7), the 1746-IG16​ module communicates with the processor via the chassis’s high-speed parallel backplane. Its design emphasizes ease of use and reliable signal acquisition in noisy industrial environments. The module’s input circuits require a 24VDC sourcing (positive) common, meaning the field device (sensor/switch) acts as the sink to ground when activated. This is a common configuration for many industrial proximity sensors and photoelectric switches. The Allen-Bradley 1746-IG16​ provides internal optical isolation between the field wiring and the controller’s logic, protecting the sensitive processor from voltage transients and ground loops that can occur in plant environments. With its balanced 16-point density, it offers an efficient use of chassis space, allowing a significant number of digital sensors to be monitored from a single module slot. As a core part of the extensive SLC 500 I/O family, the 1746-IG16​ represents a proven, cost-effective solution for gathering discrete status information in centralized control systems, contributing to the platform’s reputation for durability and straightforward integration.

Technical Specifications

Product Overview

The Allen-Bradley 1746-IB16/C​ is a fundamental and widely used 16-channel, 24V DC digital input module designed for the Allen-Bradley SLC 500 modular programmable controller system. This module serves as a primary interface for connecting a variety of DC field devices—such as pushbuttons, limit switches, photoelectric sensors, and proximity switches—to the SLC 500 processor. Its core function is to read the on/off status of these devices by sensing the presence or absence of a 24V DC signal at each of its 16 input points, converting these physical states into digital data that the SLC processor can use in its control logic. The Allen-Bradley 1746-IB16/C​ is characterized as a “sinking” input module, meaning that to signal an ON (or logic 1) state, the field device must source current intothe module’s input terminal, a wiring configuration that is standard for many industrial sensors and switches.As part of the enduring 1746 I/O family, this module slots into a 4-, 7-, 10-, or 13-slot 1746 chassis, communicating with the processor over the proprietary backplane. Its design emphasizes reliability, simplicity, and cost-effectiveness for high-density discrete input applications. Each channel is electrically isolated in groups (typically in banks of 8) and includes status LEDs for visual indication of the input state, which is invaluable for troubleshooting. The Allen-Bradley 1746-IB16/C​ represents the workhorse of discrete automation for thousands of factories worldwide. It is a cornerstone component in the vast installed base of SLC 500 systems, which, despite being a legacy platform, continues to operate reliably in countless facilities. For maintenance technicians, system integrators, and plant engineers, the 1746-IB16/C​ is a critical spare part. Its failure can incapacitate multiple machine inputs, and its availability is essential for supporting the ongoing operation, repair, and minor expansions of these reliable and cost-effective control systems, ensuring continued productivity without the need for a full system overhaul.

Technical Specifications

Product Overview

The Allen-Bradley 1746-IB8​ is a classic, 8-channel, 24V DC sinking digital input module, a fundamental building block for the widely deployed Allen-Bradley SLC 500 programmable logic controller (PLC) system. This module serves as a primary interface between the physical world of field devices and the logical world of the PLC’s processor. It is designed to reliably read the on/off status of industrial sensors and switches—such as push buttons, limit switches, proximity sensors, and photoelectric eyes—converting their 24V DC signals into a logic-level format that the SLC 500 processor can interpret within its control program. The 1746-IB8​ is categorized as a “sinking” input module, meaning that to activate an input, the connected field device must source 24V DC current intothe module’s input point, a common and robust wiring configuration in industrial control panels. This module represents a workhorse component of countless automation systems installed over several decades, providing dependable, noise-immune signal acquisition for discrete control applications.As part of the 1746 modular I/O family, the Allen-Bradley 1746-IB8​ is designed to be installed in a 1746 I/O chassis, which houses the SLC 500 processor, power supply, and other I/O modules. Its value lies in its simplicity, proven reliability, and ease of integration. Each of the eight optically isolated input channels provides a clear status indication via an LED, allowing for quick visual diagnostics. The module plays a critical role in machine and process control by feeding real-time data about the state of the manufacturing floor—whether a part is present, a door is closed, or a cycle is complete—to the central controller. For facilities operating and maintaining SLC 500-based systems, the 1746-IB8​ remains an essential spare part for repairs, system expansions, and legacy machine support, ensuring the continued operation of vital industrial infrastructure.

Technical Specifications

Product Overview

The Allen-Bradley 1746-HSTP1/A​ is a high-speed, single-axis stepper control module designed for the Allen-Bradley SLC 500 programmable logic controller (PLC) platform. This specialized I/O module integrates motion control functionality directly into the PLC rack, allowing an SLC 5/03, 5/04, or 5/05 processor to command and control a stepper motor drive for precise positioning applications. The Allen-Bradley 1746-HSTP1/A​ generates the necessary pulse and direction signals required by a standard stepper motor drive or translator, effectively serving as the intelligent motion command generator while the external drive handles the power stage and current control for the motor. This architecture provides a cost-effective and integrated solution for adding a single axis of coordinated motion to a machine primarily controlled by an SLC 500 PLC, eliminating the need for a separate motion controller in many applications.As a member of the 1746 I/O family, the 1746-HSTP1/A​ module occupies a single slot in the SLC 500 chassis and communicates with the processor over the proprietary backplane, ensuring fast and deterministic data exchange. It is capable of managing complex motion profiles, including trapezoidal velocity profiling with programmable acceleration, deceleration, slew speed, and target position. The module can execute moves in absolute or incremental modes and supports functions like homing (search for limit or home switch) and jogging. The value of the Allen-Bradley 1746-HSTP1/A​ lies in its ability to bring basic yet powerful single-axis positioning under the direct program control of the SLC processor. This enables seamless synchronization between the motion axis and other machine sequences controlled by the PLC, such as clamping, pressing, or inspection stations. It simplifies programming and troubleshooting by consolidating logic and motion control within a single hardware platform and software environment (RSLogix 500), making it an ideal choice for applications like indexing tables, linear actuators, pick-and-place units, and simple gantry systems where a dedicated multi-axis controller would be overkill.

Technical Specifications

Main Features and Advantages

Integrated PLC-Based Motion Control: The primary advantage of the Allen-Bradley 1746-HSTP1/A​ is its deep integration with the SLC 500 platform. It communicates with the processor over the high-speed backplane, allowing the motion commands and status to be handled as regular I/O data within the PLC’s ladder logic program. This eliminates the complexity of setting up communication between a separate motion controller and a PLC. Programmers can use familiar ladder logic instructions to command moves, monitor axis status, and handle faults, creating a unified control program. The module uses a dedicated block of the SLC’s data table for configuration and control, making programming straightforward within the RSLogix 500 environment.

Product Overview

The Allen-Bradley 1746-FIO4V/A​ is a versatile and space-saving 4-channel analog combination input/output (I/O) module designed for the Allen-Bradley SLC 500 modular controller platform. This module provides a hybrid solution by integrating both analog input and analog output functionality into a single, compact slot within an SLC 500 chassis. The Allen-Bradley 1746-FIO4V/A​ is specifically configured to handle voltage signals, typically offering two channels of analog input and two channels of analog output, making it an ideal choice for applications requiring a mix of monitoring and control without consuming multiple slots in the controller rack. Its core value lies in its ability to create a complete, compact control loop interface—for example, reading a process variable (like pressure or temperature via a transmitter) and sending a corrective control signal (to a valve actuator or variable speed drive)—all from one integrated module, thereby optimizing rack space and reducing system cost.As a member of the extensive 1746 I/O family, the 1746-FIO4V/A combination module​ communicates directly with the SLC 5/03, 5/04, or 5/05 processor over the proprietary backplane, ensuring fast and deterministic data exchange. The “V” in its model number denotes its primary voltage signal compatibility (e.g., 0-10V DC, ±10V DC), and the “/A” suffix indicates a specific product revision. This module serves as a critical interface for applications that require both sensing and actuation in the analog domain, bridging the gap between the digital world of the PLC and the continuous variable signals of the process world. By providing a balanced mix of inputs and outputs, the Allen-Bradley 1746-FIO4V/A​ offers system designers exceptional flexibility for small to mid-sized control systems, process skids, and machine automation where a full slot dedicated solely to inputs or outputs would be inefficient.

Technical Specifications

Main Features and Advantages

Space-Efficient, Integrated Design: The most prominent advantage of the Allen-Bradley 1746-FIO4V/A​ is its combination of input and output functionality in a single module slot. In the SLC 500 system, where rack space is a finite and valuable resource, this design allows engineers to implement both sensing and control for a process using only one slot instead of two. This optimization is crucial for compact control panels, packaged skids, or when expanding an existing system with limited free slots remaining. The 1746-FIO4V/A combination module​ provides a cost-effective and physically compact solution for implementing complete analog control loops, such as a single PID loop controlling a tank level or temperature.High Resolution and Flexible Configuration: The module delivers high-performance analog conversion with 16-bit resolution for both input and output channels, ensuring precise measurement and control. Each of the two input and two output channels can be independently configured via the SLC 500 programming software (RSLogix 500) for different voltage ranges. This flexibility allows the same Allen-Bradley 1746-FIO4V/A​ module to interface with a variety of field devices—for example, one input could be set for a 4-20mA signal (with a precision resistor) reading pressure, while the output could be set for a 0-10V signal controlling a drive. The module includes diagnostic LEDs that provide immediate visual feedback on module status and communication health, aiding in quick troubleshooting. Its robust design with internal isolation helps maintain signal integrity in electrically noisy industrial environments.

Product Overview

The Allen-Bradley 1746-C9​ is a factory-manufactured, 1.5-meter (approximately 5-foot) interconnect cable specifically designed for the Allen-Bradley SLC 500 modular programmable controller system. This cable serves a critical, yet specialized, function: it physically and electrically connects the backplanes of two adjacent 1746 series I/O chassis, allowing them to operate as a single, unified I/O rack from the perspective of the SLC 500 processor. The SLC 500 system is modular, with a processor slot and I/O module slots housed in a chassis. When an application requires more I/O points than a single chassis can hold, the 1746-C9​ interconnect cable enables system expansion by daisy-chaining a second chassis. This connection transfers both power (for the logic circuits of the I/O modules) and the vital data communication bus from the primary chassis to the secondary chassis, seamlessly extending the controller’s I/O addressing space.The Allen-Bradley 1746-C9​ is an essential component for building cost-effective, medium-density control systems. It connects to a dedicated 50-pin connector port located on the side of compatible 1746-A series chassis (such as the 1746-A4, A7, A10, A13). By using this cable, system designers can create a local rack configuration where the processor in the first chassis communicates with I/O modules in both chassis as if they were all in one physical unit, without the need for additional communication adapters or complex network configurations. The 1.5-meter length provides flexible spacing between chassis within a control cabinet. The value of the Allen-Bradley 1746-C9​ lies in its simplicity and reliability; it provides a plug-and-play method for system expansion, ensuring signal integrity and power distribution between chassis with a robust, shielded cable assembly that meets Allen-Bradley’s stringent quality and compatibility standards, thereby guaranteeing system stability and performance.

Technical Specifications

Main Features and Advantages

The primary feature of the Allen-Bradley 1746-C9​ is its role as a seamless system extender. It provides a straightforward, hardware-based solution for expanding I/O capacity without introducing network complexity, additional IP addresses, or special configuration software. The cable is a factory-molded, shielded assembly with keyed connectors, ensuring a perfect fit and reliable connection that prevents mis-wiring and protects the sensitive data bus from electromagnetic interference (EMI). This plug-and-play design drastically reduces installation time and potential errors compared to field-wiring a custom cable with 50 individual conductors. The 1.5-meter length offers practical flexibility for arranging chassis within a control panel, allowing for optimal use of space and organization of wiring ducts.Reliability and system integrity are built into the Allen-Bradley 1746-C9. The cable is specifically engineered to maintain signal integrity for the high-speed digital communication traveling between the chassis backplanes. Proper shielding is critical in the noisy environment of an industrial control cabinet to prevent data corruption and I/O communication faults. By using this official interconnect, users ensure that power distribution to the secondary chassis is within specification, preventing voltage drop issues that could cause module resets or erratic behavior. The Allen-Bradley 1746-C9​ is a durable component designed for the long-term, static installation within a cabinet. Its use guarantees compatibility and performance that is validated by Allen-Bradley, supporting the overall reliability of the SLC 500 system. For maintenance, having a spare 1746-C9​ on hand is a common and cost-effective strategy for quickly resolving rare interconnect-related issues, minimizing system downtime.

Product Overview

The Allen-Bradley 1746-C9 is a specialized 9-foot (approximately 2.74-meter) rack interconnect cable, a vital system component for the SLC 500 series programmable logic controller (PLC) platform from Rockwell Automation. This cable is not a standard network or communication cable; it serves the critical function of physically and electrically connecting two SLC 500 local I/O chassis to form an expanded local rack configuration. Its primary role is to extend the processor’s backplane, allowing a single SLC 500 CPU (such as a 5/03, 5/04, or 5/05) to address and control I/O modules distributed across multiple 4-slot, 7-slot, 10-slot, or 13-slot chassis. The Allen-Bradley 1746-C9​ transmits power, data, and control signals between the chassis, enabling them to operate as a single, cohesive I/O system under the command of one processor module located in the primary chassis.Within the SLC 500 architecture, local expansion is a cost-effective method to increase I/O point count without transitioning to a more complex remote I/O network. The 1746-C9​ cable is the essential link that makes this expansion possible. It connects to dedicated “rack interconnect” ports located on the rear of the SLC 500 chassis power supply. The “C9” designation specifically indicates the cable length. The value of the Allen-Bradley 1746-C9​ lies in its OEM design and guaranteed compatibility; it ensures reliable, high-integrity communication between chassis, which is fundamental for deterministic I/O scanning and system stability. Using a non-genuine or incorrectly specified cable can lead to intermittent communication faults, I/O dropouts, or system crashes. For system integrators and maintenance teams, the genuine 1746-C9​ interconnect cable is a key part of a reliable system build or repair, ensuring that expanded local I/O racks perform as a unified whole, maintaining the robustness and predictability expected from the SLC 500 platform throughout its long and successful service life.

Technical Specifications

Main Features and Advantages

The Allen-Bradley 1746-C9​ rack interconnect cable is defined by its purpose-built design for reliability and seamless integration. Its core advantage is guaranteed electrical and mechanical compatibility with the SLC 500 chassis. The proprietary molded connectors are precisely keyed to fit only the correct ports on the chassis power supply, preventing misconnection and ensuring all pins engage correctly. The cable’s internal construction is engineered to maintain signal integrity over its 9-foot length, carrying the multiple DC voltage levels (e.g., +5VDC, ±12VDC) and high-speed data signals necessary for backplane operation without crosstalk or excessive voltage drop. The inclusion of a robust braided shield is critical for protecting these sensitive signals from electromagnetic interference (EMI) and radio frequency interference (RFI) prevalent in industrial panels, preventing glitches in I/O communication.

Product Overview

The Allen-Bradley 1746-C7​ is a specialized, factory-terminated interconnect cable designed for linking multiple I/O chassis within the Allen-Bradley SLC 500 programmable controller system. This cable serves as the critical data and control highway that extends the processor’s I/O scanning and communication capabilities beyond the local chassis where the CPU resides. In SLC 500 systems, the processor module is typically housed in the left-most slot of a primary chassis. When the I/O requirements exceed the capacity of a single chassis, additional “expansion” or “remote” chassis are added. The Allen-Bradley 1746-C7​ cable provides the physical link between these chassis, connecting the processor’s expansion port to the expansion port of the next chassis in the series. It carries the parallel data bus, timing signals, and power necessary for the processor to address, read inputs from, and write outputs to the I/O modules located in all connected racks, effectively making them appear as a single, contiguous I/O address space to the controller.This cable is an integral component for building scalable SLC 500 control systems, a workhorse platform for machine and process automation. The 1746-C7​ is not a standard network cable; it is a proprietary, shielded, multi-conductor cable with specific connectors on each end that mate securely with the 50-pin expansion port headers on the SLC 500 chassis backplane. Its design ensures signal integrity over the relatively short distances (typically a few feet) between adjacent cabinets or racks, minimizing crosstalk and electrical noise that could corrupt I/O data. The use of a genuine Allen-Bradley 1746-C7​ cable is crucial for system reliability, as an incorrect or poorly made substitute can lead to intermittent communication faults, I/O dropouts, or complete system failure. By enabling a clean and reliable expansion path, the 1746-C7​ cable allows system designers to create control solutions that are precisely sized to the application’s I/O point count, optimizing both cost and panel layout. Its role, though often overlooked, is foundational to the stable operation of multi-rack SLC 500 installations.

Technical Specifications

Parameter Name	Parameter Value
Product Model	1746-C7
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	SLC 500 System Expansion Interconnect Cable
Compatible System	Allen-Bradley SLC 500 Series
Function	Interconnects SLC 500 I/O chassis for local expansion
Connector Type (Each End)	50-pin male header, keyed for proper orientation
Cable Length	Standard length is typically 7 feet (approx. 2.13 meters)
Cable Construction	Multi-conductor, shielded twisted pair
Shielding	Overall foil and/or braid shield for EMI/RFI protection
Maximum Number of Chassis in a Series	Limited by system; often up to 3 chassis including the CPU chassis (SLC 5/03, /04, /05)
Data Transfer	Parallel bus for high-speed I/O scanning
Power Conducted	Carries DC power for expansion chassis logic
Installation	Direct connection between chassis expansion ports