Allen-Bradley 1756-OB16D ControlLogix Digital I/O Module

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Allen-Bradley 1756-OB16D ControlLogix Digital I/O Module Product Information

Product Description

Detailed Parameters

• Channel Configuration: 16 isolated DC digital output channels, with 8 channels per group isolated; isolation voltage ≥250V AC.
• Output Specifications: 24V DC output, 0.5A rated current per channel, 2A peak current (100ms duration), supporting sinking operation mode.
• Response Time: Output turn-on time ≤1ms, turn-off time ≤0.5ms, meeting high-speed control requirements (e.g., action switching of high-speed sorting equipment).
• Protection Functions: Each channel has overcurrent protection (current limit 0.7A±10%) and short-circuit protection (hiccup mode, automatic recovery); channels are independent, and single-channel faults do not affect others.
• Operating Environment: Operating temperature 0℃~60℃, storage temperature -40℃~85℃, relative humidity 5%~95% (non-condensing), protection class IP20 (for control cabinet installation).
• Power and Communication: Powered via ControlLogix backplane bus, no external power required, power consumption ≤15W; supports high-speed backplane communication, data update rate ≤1ms.
• Status Indication: Each channel is equipped with an LED status indicator (green for output on, off for off); the module has overall power and fault indicators.
• Dimensions: Width×height×depth approximately 130mm×300mm×150mm, compatible with standard ControlLogix racks (e.g., 1756-A10, 1756-A13), rack-mounted.
• Certification Standards: UL 508, CSA C22.2 No.14, ATEX, IECEx certified, compliant with EN 61131-2 industrial control equipment standards.

Advantages and Features

• Highly Reliable Output: Group-isolated channels and independent overcurrent protection effectively prevent external load faults (e.g., short circuits) from spreading to the entire module or control system, improving system fault tolerance.
• High-Speed Response Performance: ≤1ms turn-on/off time supports high-frequency action control (e.g., high-speed solenoid valve switching in packaging machines), ensuring precise synchronization of equipment actions.
• Flexible System Integration: Seamlessly compatible with ControlLogix series controllers (e.g., 1756-L8x); realizes channel-level programming control via Logix5000 software, supporting ladder logic, structured text, etc.
• Convenient Diagnostic Maintenance: Combines LED indicators with software diagnostic functions, enabling quick location of faulty channels (e.g., short circuit, overload), reducing system downtime.
• Industrial-Grade Durability: Wide temperature range and anti-vibration design (5g acceleration, 10-500Hz) ensure stable operation in strong electromagnetic environments with dense motors and frequency converters, with mean time between failures (MTBF) ≥2×10⁶ hours.

Application Fields

• Automotive Welding Production Lines: Controls clamping solenoids and positioning cylinders of welding fixtures; 16 channels independently drive actuators of different stations, with high-speed response ensuring precise welding timing.
• Chemical Process Control: Drives pneumatic valves of reactors and start-stop relays of stirring motors; overcurrent protection resists on-site wiring faults (e.g., short circuits due to moisture).
• Logistics Automation Equipment: In cross-belt sorters, controls push solenoids of sorting grids; high-speed response and reliable output ensure accurate item sorting.
• Semiconductor Manufacturing: Drives vacuum valves and positioning sensors of wafer transfer equipment; low-ripple output avoids interference with precision electronic devices.
• Food and Beverage Filling Lines: Controls filling valves and capping motor start-stop, supporting frequent actions (thousands of switches per hour) to meet high-speed production line requirements.

Notes

• External load wiring must use shielded cables with the shield grounded at one end (control cabinet side); avoid parallel routing with power cables to reduce electromagnetic interference-induced false actions.
• Inductive loads (e.g., solenoids, relay coils) require parallel freewheeling diodes (reverse voltage ≥40V, forward current ≥1A) to absorb reverse electromotive force during turn-off and protect output channels.
• Module installation must ensure firm connection with the rack and proper insertion of backplane connectors to avoid output fluctuations or communication interruptions due to poor contact.
• Regularly (every 6 months recommended) check output voltage of each channel via programming software (should be ≥22V@0.5A load) and clean dust on the module surface to maintain heat dissipation.
• Disconnect external load power before replacing the module to avoid electrical shock during hot swapping; download configuration parameters after replacement to ensure system compatibility.

The structure and details of the product：

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