Category: Industry trends

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

Product Overview

The Allen-Bradley 1746-BAS​ is the fundamental hardware chassis, or “basic module,” that forms the physical and electrical backbone of the Allen-Bradley SLC 500 modular programmable controller system. This module, commonly referenced as the 1746-BAS-A​ denoting a specific hardware revision, is not an intelligent controller or I/O module itself, but rather the passive, metal enclosure and printed circuit board backplane that houses and interconnects all other active components. Its primary function is to provide the mechanical mounting structure, the internal data/address bus, and the power distribution pathways for a central processing unit (CPU) module, I/O modules, and special function modules. A standard Allen-Bradley 1746-BAS​ unit comes in various slot configurations, with the 4-slot version being one of the most common, providing a compact and cost-effective platform for small to medium-sized control applications.The value of the 1746-BAS-A​ lies in its role as the enabling infrastructure for a highly flexible and scalable control system. It establishes a standardized, modular architecture where users can select and mix the exact CPU performance and I/O point mix (digital, analog, special communication) required for their application. The chassis manages the critical communication between the processor in slot 0 and the I/O modules in subsequent slots via its internal backplane, ensuring reliable, high-speed data exchange. It also distributes the 5V DC logic power and 24V DC field sensor power (if provided by a power supply) to all installed modules. The robust metal construction of the Allen-Bradley 1746-BAS​ provides EMI/RFI shielding, protects sensitive electronics, and allows for secure DIN-rail or panel mounting in industrial environments. As the foundational “rack” of the SLC 500 system, the proper selection and installation of the 1746-BAS​ basic module is the first and most critical step in building a reliable, maintainable, and expandable PLC-based control solution.

Technical Specifications

Technical Specifications

Main Features and Advantages

High-Capacity, Scalable Platform: The most significant feature of the ALLEN-BRADLEY 1746-A13B​ is its 13-slot capacity, offering the highest standard module density in the SLC 500 line. This allows for the consolidation of a large number of I/O points—potentially hundreds—into a single, centralized chassis. This scalability reduces the need for multiple, distributed chassis and remote I/O networks for many applications, simplifying system architecture, reducing communication overhead, and centralizing maintenance. It provides ample room for a mix of digital I/O, analog I/O, and special function modules (like motion, communication, or high-speed counters) all in one location.Robust and Reliable Industrial Design: The chassis is built with a heavy-gauge steel frame and a protective finish to withstand the vibrations, electrical noise, and environmental conditions typical of industrial settings. The card-edge backplane connector system ensures a secure, gas-tight connection for each module, preventing communication faults due to poor connections. The backplane itself is designed for high-speed, deterministic data transfer between the processor and I/O, which is critical for real-time control performance. The ALLEN-BRADLEY 1746-A13B​ also provides excellent isolation between the backplane logic and field-side I/O circuits, enhancing system stability and noise immunity.Simplified System Integration and Serviceability: The chassis is designed for ease of use. Modules slide in and are secured with captive screws, and a removable power supply connector facilitates easy installation of the system power supply. The slot numbering is clearly marked, and the chassis includes a keying/bussing assembly that allows for proper configuration of the I/O rack address when used in multi-rack systems with a 1747-SN scanner module. For maintenance, the modular nature of the system means a failed I/O module can be individually replaced without disturbing the rest of the system. The large capacity of the ALLEN-BRADLEY 1746-A13B​ often means the entire control logic and I/O for a machine or process unit can be housed in one panel, making documentation, troubleshooting, and spare parts management more straightforward.

Technical Specifications

Main Features and Advantages

Robust and Flexible System Foundation: The primary advantage of the Allen-Bradley 1746-A7​ is its role as a versatile and scalable platform. The seven slots allow for a tailored system configuration that can grow with application needs. Users can install a processor, various combinations of high-density digital I/O (like the 1746-IB32 or OB32), analog modules, and communication adapters (like the 1747-KFC or 1747-SN) in any order, though the processor typically occupies slot 0. This modularity prevents paying for unused capacity and allows for precise system design. The robust steel construction and secure card guides ensure modules are firmly held and protected from vibration, a critical factor in industrial environments. The chassis is designed for easy serviceability; modules can be individually inserted or removed with a locking screw mechanism without disassembling the entire unit.Simplified Integration and Proven Reliability: The 1746-A7​ chassis simplifies system integration by providing a unified backplane. This eliminates the need for complex inter-module cabling, as all communication occurs via the internal bus, reducing wiring errors and improving system reliability. The chassis is designed to work seamlessly with the wide ecosystem of SLC 500 power supplies and modules, ensuring interoperability. Its design supports hot swapping of I/O modules (with proper procedures) in certain configurations, which can reduce downtime during maintenance. The Allen-Bradley 1746-A7​ is the cornerstone of a proven, battle-tested control platform. Its widespread use over decades means extensive documentation, readily available spare parts, and a deep pool of technical knowledge, making it a low-risk, dependable choice for both new installations and legacy system support. Its balance of slot capacity, physical size, and cost-effectiveness has made it one of the most popular chassis in the SLC 500 family.

Product Overview

The Allen-Bradley 1738-IE4CM12/A​ is a compact, robust, and sealed 4-channel analog input module belonging to the Allen-Bradley ArmorPoint® and ArmorBlock® I/O family, designed explicitly for direct, on-machine installation in harsh industrial environments. This module represents a paradigm shift from traditional panel-mounted I/O by eliminating the need for a protective enclosure; its hardened design allows it to be mounted directly on machinery, conveyors, or in process areas where it is exposed to dust, moisture, washdown, and physical impact. The core function of the Allen-Bradley 1738-IE4CM12/A​ is to interface with analog field sensors, such as 4-20 mA or 0-10 VDC transmitters, and digitize their signals for use by a programmable controller. It provides four independently configurable input channels, each capable of accepting industry-standard analog signals, converting the electrical current or voltage into a high-resolution digital value that is transmitted over an industrial network.As a member of the distributed I/O portfolio, the 1738-IE4CM12/A​ operates as a network node, typically communicating via EtherNet/IP or DeviceNet through an integrated communication port. Its most distinctive feature is the use of robust, industry-standard M12 circular connectors for both field device wiring and network/power connectivity, ensuring a secure, sealed connection that meets an IP67 rating. This means the module is dust-tight and can withstand temporary immersion, making it ideal for food and beverage processing, packaging, material handling, and other applications requiring frequent washdowns. The Allen-Bradley 1738-IE4CM12/A​ embodies the “IO-Link-ready” concept of placing intelligence and I/O conversion as close to the sensor as possible. This reduces installation cost by minimizing long, sensitive analog wire runs back to a central cabinet, decreases points of failure, and simplifies machine design and maintenance. For machine builders and system integrators, it provides a flexible, scalable way to add reliable analog sensing points directly where they are needed, contributing to cleaner, more modular machine designs.

Product Overview

The Allen-Bradley 1738-IB8M8​ is a versatile, eight-channel, mixed digital input/output (I/O) module belonging to the highly regarded ArmorBlock MaXum family of 1738 Compact I/O modules from Rockwell Automation. This module is designed for distributed, machine-level I/O applications where space is at a premium and environmental ruggedness is required. The defining feature of the 1738-IB8M8​ is its flexible configuration; its eight discrete channels are not fixed as either inputs or outputs. Instead, each channel can be individually configured via software as either a 24V DC sinking input or a 24V DC sourcing output, providing exceptional adaptability to match the exact I/O requirements of the application without the need for different hardware modules. This makes it an ideal solution for control panels, machine segments, or process stations where the mix of sensors and actuators may vary or evolve over time.As part of the ArmorBlock series, the 1738-IB8M8​ is built to withstand harsh industrial environments, featuring a robust IP67-rated enclosure that protects against dust ingress and temporary immersion in water. This allows for direct mounting on machinery without the need for an additional protective cabinet, significantly reducing installation costs and complexity. The module connects seamlessly via the CompactBus interface to other ArmorBlock modules or a network adapter, creating a highly distributed, modular I/O system. The value of the Allen-Bradley 1738-IB8M8​ lies in its ability to consolidate both input and output functions into a single, rugged, and compact unit, offering engineers a powerful tool to simplify wiring, reduce cabinet footprint, and deploy flexible, reconfigurable control at the very point where it is needed on the factory floor.