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SIEMENS S7-300 Digital Input Module SM 321 6ES7321-1BL00-0AA0
SIEMENS S7-300系列数字输入模块SM 321 6ES7321-1BL00-0AA0是专为自动化系统设计的高性能设备，提供安全可靠的数字信号输入，适用于广泛的工业控制环境。
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Siemens S7-300 SM321 40-Pole 32DI Input Output Module
The Siemens S7-300 SM321 is a digital input/output module designed for industrial automation, featuring 32 digital inputs optically isolated for precise signal processing and 24V DC power supply for versatile control applications.