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7.10.3
Connecting fail-safe digital inputs
On the following pages, you will find examples of connecting the fail-safe digital input from
"Basic safety", in accordance with PL d according to EN 13849-1 and SIL2 according to IEC
61508 for the case that all of the components are installed in a control cabinet.
Figure 7-20
Figure 7-21
Figure 7-22
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Connecting a sensor, e.g. Emergency Stop mushroom pushbutton or limit switch
Connecting an electronic sensor, e.g. SIMATIC FS-400 light curtain
Connecting a safety relay, e.g. SIRIUS 3TK28
7.10 Safe Torque Off (STO) safety function
Functions
215
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