Introduction In industrial control systems, accurate acquisition and real-time response of digital signals are the key to ensuring stable operation. As an important component of modern automation architecture, Yokogawa ADV161-P00 S2 digital input module is widely integrated in CENTUM VP distributed control system (DCS). It has excellent anti-interference ability, reliable channel isolation and high-speed signal response. It is designed for critical process control scenarios, especially for industries with strict requirements on equipment stability and continuous system operation. High-performance digital input design The ADV161-P00 S2 module is equipped with 16 opto-isolated input channels, which can stably acquire switch signals (such as on/off status). It supports 24 VDC nominal input voltage (voltage range is 18–32 VDC) and is compatible with various field devices, including limit switches, push button switches, proximity sensors, and dry contact signal sources. The main technical parameters are as follows: Number of channels: 16 channels per module Input type: voltage input (supports source and drain logic) Signal form: supports both dry contact and open collector Isolation characteristics: provides electrical isolation between channels and between channels and ground Redundancy support: redundant configuration can be achieved to improve system reliability Hot-swap capability: modules can be replaced without stopping the system Adopting optoelectronic isolation technology, it greatly improves the ability to resist electromagnetic interference, effectively prevents damage caused by signal distortion and electrical transients, and ensures the stability and accuracy of data acquisition. High integration with CENTUM VP system ADV161-P00 S2 is suitable for Yokogawa's N-IO network module architecture and seamlessly connects to the CENTUM VP platform. The module communicates through the control station (FCS) and can be configured, monitored and diagnosed on a unified engineering software platform. Supporting hot-swap characteristics allows maintenance personnel to replace modules without stopping the system, which has extremely high practical value for industries that require uninterrupted operation such as oil and gas, chemicals, electricity and pharmaceuticals. In addition, the module has powerful diagnostic capabilities, supporting real-time monitoring of input status, identification of wiring faults, and detection of module operating status, thereby significantly improving maintenance efficiency and reducing system downtime. Wide range of industrial application scenarios ADV161-P00 S2 digital input module is widely used in various industrial control occasions that require high-reliability digital input. Typical applications include: Monitoring of safety interlocks and emergency stop circuits Tracking of equipment operating status in MCC motor control centers Connecting to relay or PLC output interface Position ...