The emergency stop button is connected via two normally closed contacts to an EL1904 safe input terminal.The testing of the two signals is activated. These signals are checked for discrepancy. The restart and thefeedback signal are wired to standard terminals and are transferred to TwinSAFE via the standard PLC.Furthermore, the output of the ESTOP function block and the feedback signal are wired to an EDM functionblock. This checks that the feedback signal assumes the opposing state of the ESTOP output within the settime.The contactors K1 and K2 are connected in parallel to the safe output. Current measurement and testing ofthe output are active for this circuit.