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Siemens 6ES7321-7RD00-0AB0 S7, digital input SM 321, potential isolation, 4 DE; 24V DC，NAMUR/DIN 19234

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SIMATIC S7, digital input SM 321, potential isolation, 4 DE; 24V DC, NAMUR/DIN 19234, used for signals from the EX area, diagnostic capability, passed PTB testing,