Ss1 Direct Stop With Feedback To Plc - BONFIGLIOLI Agile Applications Manual

10.2.3

SS1 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.
The PLC is triggered first, that the safety function was actuated, which then decelerates the motor by
resetting the start command ("Start CW" or "Start CCW"). After the delay time t has elapsed the control
v
terminals connected to STOA and STOB interrupt the inverter release of the inverter and the internal
safety function STO is triggered 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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