836T-T252J Allen-Bradley

836T-T252J Allen-Bradley Digital Input Module

Product  Description：

Allen-Bradley Digital Input Modules are high-performance interface components designed by Rockwell Automation for industrial Programmable Logic Controller (PLC) and Programmable Automation Controller (PAC) families, including ControlLogix, CompactLogix, and Micro800 systems. These modules serve as the sensory gateway for industrial control architectures, converting high-voltage or variable field signals from discrete input devices into low-voltage logic signals readable by the system controller.

By constantly monitoring the ON and OFF states of field switches, sensors, and contacts, Allen-Bradley digital input modules enable real-time detection of machine conditions. Built with high-density channel configurations, optical isolation, and advanced diagnostics, these modules deliver reliable signal conversion, immunity to electrical noise, and fast response times necessary for precise sequence control and safety monitoring across automated production lines.

Product Parameters

• Module Types: Sink Input Modules, Source Input Modules, AC Input Modules, and DC Input Modules.

• Channel Density: 8, 16, 32, or 64 input channels per module.

• Nominal Input Voltages: 24V DC, 120V AC, 230V AC, and 5V DC TTL compatible options.

• Operating Voltage Range: 10V DC to 31.2V DC for standard 24V DC modules; 79V AC to 132V AC for standard 120V AC modules.

• Signal Isolation: Typically 1500V AC to 2500V AC optical isolation between field inputs and internal system backplane.

• Input On-State Current: Typically 2 mA to 10 mA per channel depending on input voltage.

• Off-State Leakage Current: Maximum 1.5 mA allowed to prevent false triggering.

• Hardware Input Delay: Programmable ON-to-OFF and OFF-to-ON filter times ranging from 0 ms to 20 ms.

• Backplane Current Consumption: Typically 100 mA to 350 mA at 5.1V DC backplane power.

• Operating Temperature Range: 0°C to 60°C for standard environments; -25°C to 70°C for extended temperature variants.

Product Advantages

• Superior Noise Immunity: Advanced optical isolation and configurable digital filtering protect the central processor from ground loops, high-voltage spikes, and electrical noise generated by nearby motors and drives.

• Comprehensive System Diagnostics: Select ControlLogix and CompactLogix modules feature channel-level diagnostics that detect open-wire conditions, field power loss, and internal module faults, reducing troubleshooting time.

• Removal and Insertion Under Power: Many Allen-Bradley digital input modules support RIUP, allowing maintenance personnel to replace faulty modules while the rest of the chassis remains fully powered and operating.

• Seamless Studio 5000 Integration: Fully integrated into the Studio 5000 Logix Designer software environment, allowing auto-discovery, simplified point-tag creation, and live online channel monitoring.

• Flexible Wiring Options: Removable Terminal Blocks (RTBs) and pre-wired cable interface modules reduce cabinet wiring time, prevent wiring errors, and simplify module maintenance.

Important Precautions

• Verify Wiring Configuration: Ensure proper match between field wiring and the module type, paying close attention to whether the module requires Sinking (NPN) or Sourcing (PNP) field device connections.

• Respect Off-State Current Limits: When connecting 2-wire proximity sensors or solid-state devices, verify that the sensor's leakage current does not exceed the module's maximum off-state current rating, which could cause false ON readings.

• Ensure Correct Voltage Rating: Applying AC voltage to DC input channels or exceeding the maximum continuous operating voltage will permanently damage internal optocouplers and input circuitry.

• Secure Grounding and Shielding: Maintain proper system grounding practices and route signal wires away from high-voltage power cables to minimize electromagnetic interference and false signal triggering.

• Disconnect Power During Terminal Assembly: Always de-energize the field power source before wiring or removing field connections from the terminal block, unless working with approved intrinsically safe or RIUP-certified hardware in non-hazardous areas.

Product Applications

• Discrete Manufacturing and Assembly: Receiving signals from photoelectric sensors, inductive proximity switches, mechanical limit switches, and pushbuttons on automated assembly lines.

• Packaging and Material Handling: Detecting carton presence, gate positions, sorting diverters, conveyor jams, and operator emergency stop signals.

• Automotive Industry: Monitoring robot clamp status, fixture positioning, body panel detection, and safety light curtain status.

• Food and Beverage Processing: Interfacing with valve position sensors, tank level switches, bottle presence detectors, and safety interlocks.

• Energy and Infrastructure: Monitoring circuit breaker auxiliary contacts, pump run status, panel door position switches, and remote fault alarms.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.