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SIMATIC S7-400 SM 421, DI 16x24/60 V UC
SIMATIC S7-400 SM 422, DQ 32x24 V DC/0.5 A
SIMATIC S7-400 SM 421, DI 32x120 V UC
- SIMATIC S7-400
- Digital input SM 421
- Isolated 32 DI
- 120 V DC/AC
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