- Programmable Logic Controller (PLC), SIEMENS PLC Systems
Siemens Simatic S7 300 Digital Input Module SM 321 6ES73211BH020AA0
- 6ES73211BH020AA0 Siemens SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24 V DC, 1x 20-pole 6ES7321-1BH02-0AA0
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