Siemens S7-300 - Page 80

Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
80 Installation and Operating Manual, 01/2010, A5E00085586-10
Wiring and block diagram of SM 326; DI 24 x DC 24V and internal sensor supply
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Figure 8-4 Wiring and block diagram of SM 326; DI 24 x DC 24V and internal sensor supply