1756-IB16IF | Allen-Bradley Isolated Input Module

The 1756-IB16IF is a high-speed digital DC input module used within ControlLogix automation systems. It is designed to detect rapid signal transitions and short-duration pulses, which makes it suitable for time-critical applications such as position detection, encoder input monitoring, and synchronization of high-speed events. With 16 individually isolated input channels, it allows precise and independent signal processing. Each input can detect pulses as short as 10 microseconds at frequencies up to 4 kHz, enabling ultra-fast system response. The module is often used in advanced manufacturing, packaging, and motion control systems where timing accuracy is critical.

The 1756-IB16IF provides 16 individually isolated digital input channels. Each input is capable of functioning independently, with its own isolation and signal processing circuitry. This design minimizes cross-talk and enhances system reliability in electrically noisy environments. The isolation voltage is 250V continuous, offering robust protection. The individual configuration of each point enables flexibility for complex automation tasks.

The 1756-IB16IF features per-point timestamping, which records the exact time of state changes on each input. This function is key for synchronized motion, sequence validation, or event tracking in real-time systems. The timestamp resolution is typically in microseconds and integrates with the ControlLogix controller’s logic scan. It allows the user to trace input events even between scans, improving event diagnostics and system behavior analysis. This feature is especially useful in troubleshooting and quality assurance tasks.

Yes, the 1756-IB16IF is specifically designed for peer-to-peer control scenarios. It supports direct, high-speed signal transmission between input and output modules within the same or remote chassis. This reduces overall control latency compared to controller-mediated signal paths. The fast response time and timestamped signals allow real-time decision-making at the I/O level. This makes it highly suitable for motion coordination, safety interlocks, and deterministic logic execution.

The 1756-IB16IF is a high-speed input module capable of detecting signal pulses as short as 10 microseconds. It supports input frequencies up to 4 kHz, making it ideal for applications with fast signal transitions. The nominal ON and OFF response times are just 15 microseconds, ensuring timely processing of critical events. Additionally, the module timestamps each point individually, which is crucial for synchronization in motion and sequencing systems. This performance is far beyond typical digital input modules.