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Siemens SIMATIC User Manual

Siemens SIMATIC
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Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-7EH00-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
95
Wiring and block diagram of SM 321; DI 16 x DC 24 V/125 V
Channel number
Status displays - green
Error displays - red
Backplane bus interface
Wiring diagram of the shunt circuit of the sensors
For wire-break detection, it is necessary to connect a shunt resistor to the transducer
contacts.
Figure 3-7 Wiring diagram of the shunt circuit of transducers of SM 321; DI 16 x DC 24 V/125 V

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Siemens SIMATIC Specifications

General IconGeneral
Product type designationSIMATIC
CPUVaries by model
MemoryVaries by model
Input/OutputVaries by model
CommunicationVaries by model
Programming LanguageSTEP 7
Operating Temperature0°C to 60°C (varies by model)
Protection ClassIP20
CategoryProgrammable Logic Controller (PLC)

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