Sto Direct Stop With Feedback To Plc - BONFIGLIOLI Agile Series Application Manual Functional Safety

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 per-
forms 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.
28 AGL-STOV0-01SV0-05
06/12