Siemens SIMATIC S7-200

Quick review
1.5 The PLC scan cycle: Reading the inputs
Getting Started - Advanced
Training Documents, 09/2007, A5E01469795B
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1.5 The PLC scan cycle: Reading the inputs
All SIMATIC programmable controllers use a scan cycle. In this cyclical operation, the switch
states are read at the inputs and stored in the process input image (PII). This information is
interpreted by your control program.
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