Siemens SIMATIC S7-300 Getting Started page 11

Safety elements
The following figure shows the safety elements in the protection zone.
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Figure 2-1
CPU 317TF-3PN/DP: Controlling a SINAMICS S120 with Safety Functions
Getting Started, 10/2013, A5E02982990-04
Signal lamps for indicating the operating status
Safety door with 2 position switches
Emergency stop switch
Key switch for setup mode
Acknowledgment button for safety-related events and reintegration of the F-I/O
Production area with access protection
Preparation
2.2 Task
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