Category: Industry trends

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.

Product Overview

The Honeywell 900A01-0101 Analog Input Module​ is a high-performance, multi-channel interface card designed for integration into Honeywell’s programmable logic controller (PLC) and distributed control system (DCS) architectures, such as those within the MasterLogic or earlier PLC series. This module serves as a critical data acquisition front-end, specializing in the precise measurement and digitization of continuous analog signals from a wide array of field instruments. Its primary function is to accept low-level DC voltage or current signals—typically the industry-standard 4-20 mA current loop, 0-10V DC, or similar ranges—from sensors measuring temperature, pressure, level, flow, and other vital process variables. The Honeywell 900A01-0101​ converts these analog signals into high-resolution digital values that can be processed by the central controller’s logic, enabling real-time monitoring, closed-loop control, alarming, and data logging. Featuring multiple isolated input channels, it allows for the simultaneous monitoring of numerous process points from a single module slot, optimizing rack space and system cost. The module incorporates advanced signal conditioning, filtering, and isolation circuitry to ensure accurate and reliable data even in electrically noisy industrial environments. As a core component of a Honeywell control system, the 900A01-0101 Analog Input Module​ provides the essential link between the physical process and the digital control strategy, playing a pivotal role in maintaining operational efficiency, product quality, and process safety across continuous and batch manufacturing industries.

Technical Specifications

Main Features and Advantages

High-density, configurable input channels: The Honeywell 900A01-0101​ provides a high channel count in a single module, allowing for the consolidation of many analog measurement points, which reduces the number of modules required, saves valuable rack space, and lowers overall system cost and complexity. A key feature is the per-channel configurability, often set via software or hardware (jumpers/DIP switches). Each of the 16 channels can be independently configured as a voltage or current input, and within a specific range. This flexibility allows a single 900A01-0101 Analog Input Module​ to interface with a diverse mix of sensors (e.g., pressure transmitters, temperature transmitters, level sensors) without requiring different module types, simplifying design and spare parts inventory.Precision measurement and robust signal integrity: Engineered for process control, the module delivers high accuracy and resolution, ensuring that even small changes in the process variable are detected and can be acted upon by the control system. It incorporates advanced signal conditioning that includes filtering to suppress high-frequency noise, linearization, and cold-junction compensation for certain thermocouple types (if applicable). The electrical isolation between channels and from the controller’s logic prevents ground loops, minimizes cross-talk, and protects the sensitive system electronics from transient voltage spikes and common-mode noise prevalent in industrial settings, guaranteeing reliable and stable data acquisition.

900a01-0101_honeywell_analog_input_module

Product Overview

The WAGO 750-338​ is a PROFIBUS DP fieldbus coupler, serving as the intelligent central unit and communication gateway for a WAGO-I/O-SYSTEM 750 station. This module is the foundational component that transforms a collection of individual WAGO digital, analog, and special function I/O modules into a cohesive, addressable node on a PROFIBUS DP network. Its primary function is to manage all data exchange between the higher-level automation controller (the PROFIBUS DP master, such as a Siemens S7 PLC) and the connected field devices wired to the I/O modules. The WAGO 750-338​ handles the complex tasks of mapping I/O data into the process image, managing the internal power distribution for the connected modules, and providing comprehensive diagnostic information for the entire station. It effectively acts as the “brain” of a remote or distributed I/O drop, enabling decentralized control architectures that reduce wiring costs and improve system flexibility.Designed for maximum versatility, the WAGO 750-338​ supports the connection of up to 64 WAGO I/O modules on its right side via the proprietary internal local bus (WAGO I/O System bus), allowing for the creation of dense, highly customized I/O stations. The coupler automatically detects and identifies all connected modules, simplifying configuration. It is engineered for robust industrial performance, with features like a wide operating temperature range, high immunity to electromagnetic interference, and secure screw-cage clamping connections. The WAGO 750-338​ provides a reliable and deterministic link to the PROFIBUS DP-V1 network, supporting standard cyclical data exchange as well as acyclic services for parameterization and diagnostics. For system integrators, this coupler is the key to leveraging WAGO’s renowned modular I/O system, enabling the creation of scalable, maintainable, and high-performance automation solutions across a vast array of industries.

Technical Specifications

Main Features and Advantages

The WAGO 750-338​ PROFIBUS DP coupler stands out for its plug-and-play simplicity, robust connectivity, and diagnostic depth. A key feature is its automatic module recognition. Upon power-up, the coupler scans the local bus, identifies all connected I/O modules by their electronic type codes, and automatically assigns addresses within the process image. This eliminates manual address setting and drastically reduces commissioning time and potential for configuration errors. The coupler supports the full PROFIBUS DP-V1 standard, enabling not only fast, cyclical exchange of I/O data but also advanced acyclic communication for reading detailed module information, writing parameters, and retrieving comprehensive diagnostic data, which is invaluable for preventative maintenance.