- Programmable Logic Controller (PLC), SIEMENS PLC Systems
Simatic S7 400 SM 421 Digital Input Module 24V DC 6ES74211BL010AA0
- 6ES74211BL010AA0 Siemens SIMATIC S7-400, SM 421 DIGITAL INPUT MODULE, OPTIC. ISOLATED, 32 DI, 24V DC 6ES7421-1BL01-0AA0
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