Yokogawa SM21-AG4 PLC Interface Module with 4-Channel Input 24-Bit Resolution and 1500Vrms Isolation for Industrial Automation

1. Product Overview and Technical Specifications

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The SM21-AG4 is a high-performance multi-input data acquisition module designed for industrial automation and process control applications. This advanced module features four universal analog input channels capable of handling various signal types including voltage, current, thermocouple, and RTD inputs with automatic signal type recognition. Key technical specifications include 24-bit delta-sigma ADC resolution, a sampling rate of 100 samples per second per channel, and an operating temperature range of -20°C to +70°C. The module provides 1500Vrms channel-to-channel isolation and features a compact DIN-rail mountable design. With its wide power supply range of 10-30V DC and compliance with IEC 61000 EMC standards, the unit ensures reliable operation in harsh industrial environments while maintaining measurement accuracy of ±0.05% of reading.

​2. Application Advantages and Functional Features

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This versatile module excels in process monitoring applications requiring high-precision multi-point data acquisition. The SM21-AG4 is particularly effective for temperature monitoring systems, energy management applications, and equipment condition monitoring in industrial facilities. Key advantages include automatic sensor diagnostics, programmable filter settings, and real-time data processing capabilities. The module's universal input design reduces inventory requirements by supporting multiple sensor types, while the built-in signal conditioning eliminates the need for external transmitters. These features combine to provide enhanced measurement accuracy, reduced installation costs, and simplified maintenance procedures. The module's scalable architecture allows for easy system expansion, making it ideal for both small-scale monitoring and large-scale distributed control systems.

​3. System Integration and Performance Benefits

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The module offers seamless integration through industry-standard communication protocols including Modbus RTU and Ethernet/IP. Advanced features include configurable alarm thresholds, data logging capability, and web-based configuration interface. The unit's robust construction ensures reliable performance in electrically noisy environments, while the isolated inputs prevent ground loop issues. These capabilities enable precise process monitoring while reducing installation time and improving system reliability. The module's diagnostic functions and remote configuration options contribute to reduced maintenance costs and optimized system performance in various industrial applications including manufacturing, water treatment, and energy management systems.

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Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

we are major in PLC,Sensors,HIM,Transmitters.

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