32 AGL-STOV0-01SV0-05
06/12
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 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.
The PLC is triggered first, that the safety function was actuated, which then decele-
rates the motor by resetting the start command (“Start CW” or “Start CCW”). After
the delay time t
v
has elapsed the control 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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