440N-Z21SS3PH Allen-Bradley

440N-Z21SS3PH Allen-Bradley Digital Input Module

Product  Description：

Allen-Bradley Digital Input Modules serve as primary interface devices within Rockwell Automation Programmable Logic Controller (PLC) and Programmable Automation Controller (PAC) ecosystems, including the ControlLogix, CompactLogix, and Micro800 series. These modules detect discrete binary electrical signals generated by field sensors and switches, translating incoming physical voltage states into digital data processed by the main controller.

By capturing real-time operational status, Allen-Bradley digital input modules enable automation controllers to monitor machine states, execute complex logic routines, and respond instantly to system events. They feature high-density channel configurations, optical isolation to safeguard sensitive internal backplane circuitry from field line surges, integrated diagnostic capability, and removable terminal blocks to streamline maintenance and panel installation.

Product Parameters

• Module Categories: Digital Input Modules (DC Voltage, AC Voltage, AC/DC Dual Voltage).

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

• Nominal Operating Voltages: 24V DC (Sink or Source), 120V AC, 230V AC, and 5V TTL levels.

• Signal Input Voltage Ranges: 10V DC to 30V DC for 24V DC modules; 79V AC to 132V AC for 120V AC modules.

• On-State Voltage Limits: Minimum 10V DC for active High signal detection.

• Off-State Voltage Limits: Maximum 5V DC or up to 1.5 mA leakage current threshold.

• Galvanic Isolation: 1500V AC or higher optical isolation between field wiring terminals and system backplane logic.

• Input Delay Filters: Configurable digital filtering delays ranging from 0 ms to 20 ms to suppress contact bounce and false signals.

• Operating Temperature: -25°C to +70°C for standard and extreme environment variants.

• Power Consumption: Low internal backplane current draw, varying from 50 mA to 250 mA depending on series and channel density.

Product Advantages

• Industrial Durability: Engineered with high immunity to electromagnetic interference and mechanical shock, ensuring stable signal detection in noisy plant environments.

• Advanced Diagnostics: Integrated point-level indicators and electronic diagnostics detect open wire faults, short circuits, and missing field supply voltages, sending alerts directly to Studio 5000 software.

• Flexible Signal Integration: Supports both sinking (NPN) and sourcing (PNP) field device connections, allowing seamless integration with a wide array of industrial sensors.

• Configurable Input Filtering: Software-defined input filter times reduce noise interference and physical switch contact bounce without requiring hardware filter modifications.

• High Channel Density: Compact design saves valuable DIN rail and cabinet space while supporting up to 64 discrete inputs per single module slot.

Important Precautions

• Verify Voltage Compatibility: Ensure field sensor operating voltages strictly match the voltage rating specified on the input module to avoid damaging internal optocouplers.

• Observe Leakage Current Limits: When connecting 2-wire proximity sensors or solid-state outputs, ensure sensor Off-state leakage current remains below the module Off-state threshold to prevent false triggering.

• Separate Signal and Power Cabling: Run input signal cables in dedicated wire raceways separated from high-voltage AC power and motor drive cables to minimize induced capacitive noise.

• De-Energize Prior to Servicing: Disconnect main power supplies before attaching or removing field terminal blocks unless the specific module series explicitly supports Removal and Insertion Under Power (RIUP).

• Maintain Proper Earth Grounding: Connect module chassis shielding and common grounds to a clean earth ground point to ensure reliable optical isolation performance and electrostatic discharge protection.

Product Applications

• Discrete Assembly and Packaging: Monitoring limit switches, proximity sensors, pushbuttons, photo-eyes, and safety interlocks along high-speed packaging lines.

• Automotive Manufacturing: Detecting workpiece presence, clamp position states, robotic cell door interlocks, and conveyor position switches.

• Process Automation: Monitoring pressure switches, flow switches, level sensors, and valve limit switches across chemical, pharmaceutical, and water treatment operations.

• Material Handling and Logistics: Tracking carton locations, belt alignment sensors, diverter gate positions, and emergency stop circuits in automated sorting centers.

• Energy and Infrastructure: Capturing breaker status contacts, fault indicators, switchgear state indicators, and enclosure intrusion sensors in distribution substations.

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.