Siemens S7-400 SM421 32DI 6ES7421-1BL01-0AA0
Siemens S7-400 SM421 32 DI
6ES7421-1BL01-0AA0
SIPLUS S7-400 SM 421, isolated 32 DI; 24 V DC
SIMATIC S7-400 SM421 32DI
SM421 Digital Input Module, (32) 24V DC Digital Inputs, Sinking, Optically Isolated
https://mall.industry.siemens.com/mall/en/WW/Catalog/Product/6ES7421-1BL01-0AA0
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