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6ES7221-1BH32-0XB0 | SIEMENS SIMATIC S7-1200, Digital Input SM 1221, 16 DI, 24 V DC, Sink/Source: Amazon.com: Industrial & Scientific
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Siemens 6ED1052-1MD08-0BA0 LOGO! 12/24RCE, logic module, disp PS/I/O: 12/24VDC/relay, 8 DI (4AI)/4DO, memory 400 blocks, modular expandable, Ethernet: Amazon.com: Industrial & Scientific
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