Safety engineering
Functional test
Monitoring the safety function with a PLC
11
11.4
11.4.3
11.4−3
EDSVF9383V EN 7.1−04/2012
11.4.3 Monitoring the safety function with a PLC
K
SR
µC
PWM
PWM
RFR
DC 24 V
Z1
9300
S1
S2
IN 1
IN 2
IN 3
IN 4
X11/34
X11/33
X11/K32
X11/K31
X5/28
DIGOUT
9300vec104
Fig. 11.4−1 Circuit diagram for monitoring the safety function with a PLC
S1, S2 Separate disconnection options of the two disconnecting paths
K
SR
Safety relay
X11/34 Safety relay control
X11/33 Safety relay control (GND)
X11/K32 Forcibly guided feedback contact (24 V)
X11/K31 Forcibly guided feedback contact
DIGOUT Digital output for evaluating the motor current
X5/28 Controller inhibit
Z1 Programmable logic controller (PLC)
IN 1 − 4 Digital inputs
The following conditions must be met:
ƒ The PLC must be programmed such that the complete system is set to a
safe state immediately when the function check leads to an
impermissible state.
ƒ The parameter setting of a digital output must be such that you can
conclude to the output current I
motor
of the drive (see parameterisation
example).
Requirements
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