Category: Industry trends

Application Scenarios

In a high-speed bottling line, a rotary encoder mounted on the filler turret provides position feedback for the capping station. The line runs at 1,200 bottles per minute, requiring the control system to detect the exact angular position of each bottle with sub-millisecond timing. When the original encoder interface began producing erratic counts during peak production, bottles were misaligned at the capper, causing jams and product waste. After replacing the failing module with a 1734-IK, the line restored reliable position tracking at the full 1 MHz input frequency, eliminating the misalignment jams. The module’s five status indicators—for module health, network status, and A, B, and Z inputs—allowed the maintenance team to visually confirm proper encoder operation without opening the program.

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Technical Principles and Innovative Values

Innovation Point 1: Multiple Counter Configurations in a Single Module. The 1734-IK supports five distinct operating modes—Counter, Encoder X1, Encoder X2, Encoder X4, Period/Rate, and Rate Measurement—selectable through configuration bits in the Logix Designer application. This flexibility allows one module to serve diverse applications: simple event counting, quadrature position tracking with 4× resolution multiplication, or direct frequency measurement. The X4 encoder mode multiplies resolution by four, capturing every edge of both A and B channels for the highest possible positional accuracy from a given encoder.

Innovation Point 2: Configurable Input Filtering for Noise Immunity. The 1734-IK provides selectable input filter frequencies of 50 kHz, 5 kHz, 500 Hz, or 50 Hz, with an option to disable filtering entirely. In electrically noisy environments such as welding cells or near variable frequency drives, the 50 Hz or 500 Hz filter settings eliminate spurious counts from electrical interference. In high-speed applications where maximum frequency response is required, the filter can be bypassed to preserve the full 1 MHz input capability.

Innovation Point 3: Z-Input Inversion and Store Control Modes. The module allows the Z (marker) input to be inverted through configuration, accommodating encoders with either active-high or active-low Z pulses. Three store control modes—Store/Continue, Store/Wait/Resume, and Store,Reset/Wait/Start—enable the module to capture count values at precise moments defined by the Z input, essential for homing routines, registration control, and cyclic position reset applications. This hardware-level store capability eliminates the latency and jitter that would occur if the controller had to poll the count value in software.

Innovation Point 4: Removal and Insertion Under Power (RIUP). The 1734-IK supports RIUP, allowing module replacement while the POINT I/O system remains energized and the process continues running. Combined with the removable wiring base system, this feature reduces mean time to repair from hours (requiring controlled shutdown) to minutes. The module’s Auto Device Replacement (ADR) capability further minimizes downtime by automatically restoring configuration when a replacement module is installed.

Application Scenarios

A paper-mill press section was protected by a conventional safety relay system that monitored guard doors and e-stop contacts, but had no safety-rated visibility of the press roll speed. The speed feedback came from a 4–20 mA tachometer signal feeding a standard analog input, which was read only by the standard control task. The limitation was structural: a worn coupling or a failing sensor could not produce a safety demand, because the safety system could not see the value that defined the hazard.The mill added a 1734-IE4S​ in a POINT Guard I/O node at the press-end panel, with the tachometer signal landed on one channel and two pressure transmitters on the remaining channels. The module’s tachometer mode accepts 0–24 V input at 1–1000 Hz with configurable ON/OFF thresholds, which allowed the safety task to evaluate a safe-speed condition directly rather than relying on the standard controller to pass it a value. During commissioning, the built-in diagnostics caught a degraded shield termination on one pressure loop — flagged as an input fault rather than reported as a steady reading — before it could affect the safety function. The mill’s safety validation was completed without replacing the existing GuardLogix controller; the module dropped into the same POINT I/O physical footprint already occupied by standard I/O.The significance is that analog safety is not simply “a more accurate digital input.” Many hazards are continuous in nature — overspeed, overpressure, excess temperature, high level — and the safety decision depends on the magnitude and rate of change of a measured value. A discrete safety input cannot represent that. The 1734-IE4S​ provides a certified path for those variables into the safety task, so the protection function and the process control function can share the same transmitter rather than requiring a separate dedicated sensor.

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Description

The 1734-IE2C is an Allen-Bradley (Rockwell Automation) POINT I/O analog current input module featuring 2 single-ended, non-isolated input channels. Designed for distributed control architectures, this module accepts industry-standard 4–20 mA and 0–20 mA current signals and converts them to 16-bit signed integer data for use by ControlLogix, CompactLogix, and other Logix-family controllers via compatible POINT I/O communication adapters.

The 1734-IE2C integrates delta-sigma analog-to-digital conversion, on-board channel-level alarm processing, and configurable digital filtering into a compact DIN-rail mounted package. With removable terminal blocks and comprehensive LED diagnostics, it streamlines both commissioning and ongoing maintenance in distributed I/O systems.

Application Scenarios

In a municipal water treatment facility, a CompactLogix controller needed to monitor pressure transmitters and flow meters located across a sprawling filtration building. The existing wiring ran hundreds of feet back to a central control panel, introducing noise and voltage drop that degraded measurement accuracy. The engineering team deployed a 1734-IE2C module on a remote POINT I/O rack near the process area, connected via EtherNet/IP to the main controller.

Each 1734-IE2C accepted 4–20 mA signals from two pressure transmitters. The module’s delta-sigma converter and configurable 60 Hz notch filter effectively rejected electrical noise from nearby pump VFDs. When a transmitter wire loosened, the 1734-IE2C‘s underrange status bit triggered a red flashing LED and reported the fault to the PLC, allowing operators to dispatch maintenance before the pressure reading drifted out of tolerance. The distributed approach reduced field wiring by 60% and improved measurement stability across the facility.

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Application Scenarios

On a high-speed bottling line, operators were struggling with intermittent “ghost” signals on a proximity sensor detecting bottle caps. A mechanical switch near a variable-frequency drive was generating electrical noise, causing the sensor input to flicker and occasionally register a false trigger. This led to a few cases of the filler head actuating at the wrong time, resulting in product waste and a brief line stoppage. The maintenance team traced the issue to the input module’s inability to filter out the high-frequency interference. By replacing the module with the 1734-IB8​ and configuring its software filter to 10 ms, they were able to effectively “debounce” the signal. The 1734-IB8‘s combination of a fixed 0.5 ms hardware filter and user-adjustable software filtering eliminated the false triggers without sacrificing the fast response time needed for the high-speed application, restoring smooth and reliable operation to the line.

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Application Scenarios

In a wastewater treatment plant, motor control centers are distributed across multiple buildings, each housing pump starters, valve actuators, and level switches that operate on 120V AC control power. Running individual signal wires back to a central PLC cabinet would require extensive conduit and labor. The 1734-IA4 installs directly in a remote POINT I/O rack near the equipment, accepting 120V AC status signals from pump run contacts, valve limit switches, and float switches. The module communicates back to the main controller over an industrial network, reducing wiring costs while providing reliable status feedback for the plant SCADA system.

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Product Overview

The Allen-Bradley 1734-EP24DC​ is a 24V DC Power/Bus Extension Module in the Bulletin 1734 POINT I/O family — Rockwell Automation’s modular, rackless distributed I/O system. It is important to be precise about what this module is and is not: it is not a standalone AC-to-DC power supply, and it is not a module that creates a new independent power segment. The Allen-Bradley 1734-EP24DC​ is an extension module that passes the incoming 24V DC field power straight through to the modules on its right while injecting additional POINTBus backplane current, extending the number of I/O modules a single POINT I/O adapter can support. Rockwell lists the product as Active, so it remains a current catalog item rather than a legacy spare.Physically, the Allen-Bradley 1734-EP24DC​ occupies a single POINT I/O slot width and snaps onto a standard 35 mm DIN rail using the same interlocking side pieces as every other 1734 module, with the removable terminal block (RTB) on top carrying the 24V DC input. Its dark grey housing provides immediate visual identification in a mixed I/O bank. The module is invisible to the controller: it does not appear as a node in the Studio 5000 / RSLogix 5000 I/O tree, and it consumes no input or output data — it simply passes field power and reinforces bus power.The module’s value is concentrated in two capabilities. First, it lets an I/O bank grow beyond the current budget of the adapter: depending on the current draw of the individual modules, a system can expand in 4-to-17-module increments, all the way to the architecture maximum of 63 I/O modules. Second, by placing the Allen-Bradley 1734-EP24DC​ between groups of modules, the designer creates a new field-voltage partition — meaning a fault, short or power interruption on one side cannot drag the entire bank down. This functional partitioning is what turns a large, vulnerable I/O string into a fault-tolerant architecture.

Technical Specifications

Product Overview

The ALLEN-BRADLEY 1734-ADN is a POINT I/O DeviceNet Network Adapter engineered to serve as the communication gateway between POINT I/O modules and a DeviceNet network. As a core component of the Bulletin 1734 POINT I/O distributed I/O system, the ALLEN-BRADLEY 1734-ADN operates simultaneously on the primary DeviceNet network and the internal POINTBus backplane, functioning as both a DeviceNet slave to the network master and a master scanner for the POINT I/O modules on its backplane . This dual-network role enables the adapter to collect I/O data from connected modules and transmit it to a DeviceNet scanner (such as the 1756-DNB), while also receiving output commands from the controller and routing them to the appropriate I/O modules.

The ALLEN-BRADLEY 1734-ADN supports up to 63 POINT I/O modules on its backplane, accommodating a maximum of 504 I/O points . The adapter features autobaud capability, automatically detecting and matching the DeviceNet network baud rate from 125K, 250K, or 500K bits per second . Its auto-start mode, available in Series B versions, automatically configures all backplane modules by reading module IDs, setting sequential addresses, and generating a scan list—reducing commissioning time from hours to seconds . The ALLEN-BRADLEY 1734-ADN also supports Auto Device Replacement (ADR), allowing failed modules to be replaced without manual reconfiguration, as the adapter transfers stored configuration parameters to the new module automatically .

The module operates from a 24V DC power supply, provides 1000 mA of POINTBus current for backplane modules, and features LED indicators for adapter status, DeviceNet status, and POINTBus status . The ALLEN-BRADLEY 1734-ADN is designed for DIN rail mounting and supports Removal and Insertion Under Power (RIUP), enabling module replacement without system shutdown . As of December 31, 2026, this adapter has been discontinued by Rockwell Automation with no planned direct replacement, making existing inventory increasingly valuable for maintenance of installed systems .

Technical Specifications

Main Features and Advantages

The ALLEN-BRADLEY 1734-ADN delivers core value by integrating DeviceNet connectivity, POINTBus management, and automated configuration features into a compact adapter that simplifies distributed I/O deployment.

Dual-Network Architecture: The ALLEN-BRADLEY 1734-ADN resides simultaneously on the primary DeviceNet network and the POINTBus backplane, functioning as a slave to the network master while acting as a master scanner for POINT I/O modules . This dual-role capability eliminates the need for separate scanner hardware, consolidating I/O data collection and network communication into a single module.

Auto-Start Configuration: Series B versions of the ALLEN-BRADLEY 1734-ADN support an auto-start mode that automatically sets all backplane modules to Auto Baud, reads module IDs, sets sequential addresses, and generates a scan list with I/O mapping based on byte, word, or double-word boundaries . This feature drastically reduces commissioning time, allowing the I/O system to be operational before other network nodes are added.

Auto Device Replacement (ADR): The ALLEN-BRADLEY 1734-ADN supports ADR functionality, automatically transferring configuration parameters from a failed module to its replacement . When an identical module is inserted, the adapter assigns the original node number and downloads stored configuration data, minimizing downtime and eliminating manual reconfiguration.

Autobaud Detection: The adapter automatically detects the DeviceNet network baud rate and configures itself to match, supporting 125K, 250K, and 500K bits per second . This feature simplifies network integration and prevents communication errors caused by mismatched baud rates.

Removal and Insertion Under Power (RIUP): The ALLEN-BRADLEY 1734-ADN supports RIUP, allowing modules to be replaced while the system remains powered . Combined with the removable wiring system, this capability enables maintenance and expansion without process interruption.

Product Overview

The Allen-Bradley 1734-ACNR​ is a POINT I/O ControlNet Network Adapter manufactured by Rockwell Automation. It acts as the communications gateway between a ControlNet network and the local POINT I/O modules mounted on its POINTBus backplane, transferring both scheduled I/O data and peer-to-peer messages between the controller and the field-mounted I/O assembly. In a distributed I/O architecture, the Allen-Bradley 1734-ACNR​ is the module that establishes the node: it carries the network MAC ID, manages connection ownership, packages I/O data for transmission and reports the status of the backplane, system power and field power through its front-panel indicators.As a member of the Bulletin 1734 POINT I/O family, the Allen-Bradley 1734-ACNR​ is built around modularity and space efficiency. It is typically mounted as the left-most module of a POINT I/O group, with digital, analog and specialty modules snapped directly onto the same DIN rail and interconnected through the built-in backplane. The adapter itself contains an internal DC-DC converter that changes the externally supplied 24 VDC into the 5 VDC required by the POINTBus, allowing it to power the mounted I/O modules directly without a separate backplane supply for many configurations.The trailing “R” in Allen-Bradley 1734-ACNR​ denotes redundant media support. Two coaxial BNC channels provide the physical network interface, so a break in the primary cable does not by itself disable the I/O node. Together with a Network Access Port for local programming and maintenance, comprehensive diagnostics and DIN-rail mounting, the module is designed for distributed I/O applications where predictable scan behaviour and serviceability matter.

Technical Specifications

Technical Specifications

Main Features and Advantages

Certified Functional Safety: The Allen-Bradley 1734-OB8S carries TÜV Rheinland certification for SIL CL 3 according to IEC 61508 and PLe/Category 4 according to EN ISO 13849-1, making it suitable for the most demanding functional safety applications . This certification provides documented evidence of the module‘s reliability and failure rates, simplifying safety validation for machine builders and system integrators.

Flexible Operational Modes: The Allen-Bradley 1734-OB8S supports both single-channel and dual-channel configurations. In dual-channel mode with safety pulse testing enabled, the module achieves PLe/Cat. 4/SIL CL3 ratings, enabling redundant control of safety actuators for maximum risk reduction. Single-channel mode provides PLd/Cat. 2/SIL CL2 capability for applications with lower risk profiles, offering cost-effective safety compliance .

Comprehensive Diagnostics: Each output channel on the Allen-Bradley 1734-OB8S includes pulse-test capability for detecting field wiring short circuits to positive or negative supply rails. When the module detects a fault, outputs are de-energized and remain in a safe state until the fault condition is cleared . This diagnostic coverage is essential for maintaining high Performance Level ratings in safety functions.

Compact POINT I/O Integration: The Allen-Bradley 1734-OB8S occupies a single slot in any standard POINT I/O chassis, sharing the same terminal bases and mounting infrastructure as non-safety modules. This density and compatibility reduce panel space requirements and simplify system architecture compared to proprietary safety I/O platforms.

Robust Output Protection: Electronic short-circuit protection on the Allen-Bradley 1734-OB8S prevents damage from field wiring faults and ensures reliable operation in industrial environments where wiring errors or insulation failures may occur . The module’s solid-state output design eliminates contact wear and provides consistent switching performance over millions of operations.

Technical Specifications

Main Features and Advantages

On-machine output placement that eliminates cabinet dependency.​ The core advantage of the Allen-Bradley 1732E-OB16M12R​ is its ability to be mounted directly on the machine frame, actuator bank, or conveyor structure. In a conventional system, each solenoid, indicator lamp, and diverter requires a home-run cable back to the main panel; with the module installed within arm’s reach of the loads, those runs shrink from tens of metres to a few metres. The result is less conduit and wire, a smaller and cheaper control cabinet, fewer wiring errors, and a much shorter fault-trace path during troubleshooting.M12 connectivity for fast installation and replacement.​ Every output on the Allen-Bradley 1732E-OB16M12R​ terminates in a standard integral M12 connector, while both network ports use M12 D-coded connectors. Electricians can install and replace pre-made patch cords in seconds without stripping, crimping, or terminating wires in a cabinet. The threaded locking connectors resist vibration loosening on mobile and reciprocating equipment, and a failed module or cable can be swapped in minutes rather than the half-hour typically spent tracing a terminal-block circuit—substantially reducing mean time to repair on a production line.High output current that drives loads directly.​ Each output on the Allen-Bradley 1732E-OB16M12R​ handles up to 2.0 A continuously, with a 4.8 A / 10 ms surge current repeatable every 2 seconds, and the module total is limited to 8.0 A across all outputs. This is sufficient to drive most 24 VDC solenoids, relays, indicator lamps, and small contactors directly without interposing relays. The sourcing (PNP) configuration also matches the common positive-common wiring practice used in North American and European machinery. Per-point electronic overload and short-circuit protection prevents a single failed actuator from taking down the remaining outputs.Device-Level Ring resilience.​ The dual EtherNet/IP ports let the Allen-Bradley 1732E-OB16M12R​ participate in a DLR topology. If a cable is cut or a connector is damaged between two nodes, traffic reroutes through the alternate path and production continues without a network fault. This is particularly valuable on long conveyor lines, rotary fillers, and mobile equipment where cable damage is a persistent risk.Sealed for the harshest plant-floor environments.​ The IP65/IP66/IP67/IP69K housing is rated for high-pressure, high-temperature washdown and temporary immersion, making the Allen-Bradley 1732E-OB16M12R​ suitable for food and beverage, pharmaceutical, and washdown-duty applications without an additional protective box. With Studio 5000 Add-On Profile support, it drops straight into Logix projects, and its full set of status LEDs—module, network, link, auxiliary power, and I/O status—gives operators and maintenance staff immediate visibility into module and load condition.