Sto Direct Stop With Feedback To Plc - BONFIGLIOLI Agile Applications Manual

10.1.3

STO Direct Stop with Feedback to PLC

The application example shows a drive control system with PLC and safety module according to EN ISO
13849-1 PL d and category 3 or IEC 61508 SIL 2. A PLC performs the process control of the frequency
inverter and can start the drive profiles via commands.
If the protective device is actuated, e.g. safety door open, the release paths of the safety module are
interrupted.
Through the interruption of the control voltages on stop paths STOA and STOB of the frequency the
integrated safety function with SIL 2 according to EN-61800-5-2 is activated by interrupting the inverter
release.
The safety module monitors the function of the switches S1 and S2 which are located outside of the
electrical cabinet.
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