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SIEMENS 6ES7321-1BH10-0AA0 SIMATIC S7-300, DIGITAL INPUT SM 321, ISOLATED, 16 DI, 24 V DC, 1X 20-POLE The **SIEMENS 6ES7321-1BH10-0AA0 SIMATIC S7-300 SM321** is a digital input module for the S7-300 ...