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SIMATIC. S7-300. S7-300 Module data. Manual. 06/2017. A5E00105505-AJ The notices referring to your personal safety are highlighted in the manual by a safety .. Digital input module SM 321; DI 32 x DC 24 V; (6ES7321-1BL00-0AA0) . SIMATIC. S7-300. S7-300 Module data. Manual. This description is part of the S7-300 documentation New digital input module SM 321 DI 16 x DC 24V/125V.the data in this manual are reviewed regularly and any necessary S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP 12.3.6 1 How to Protect Digital Output Modules against Inductive Surge Voltage ..12-26.