Emergency Stop Routine - HEIDENHAIN TNC 415 Technical Manual

1.3 EMERGENCY STOP routine

The internal EMERGENCY STOP shutdown of the TNCs is tested when the supply voltage is
switched on, i.e. the supply voltage to each processor is turned off for a short time.
Suitable protective circuitry must be used to ensure that the positioning module is not ready for
operation if the NC test reveals an error, i.e. the voltage for the feedback is mutually interrupted.
This can be achieved by the circuit illustrated. The test starts when the control voltage is switched
on.
Switch opens for a short time when control
voltage to each processor is turned on
X41/34
"Control is
ready"
EMERGENCY
STOP buttons
Control
voltage
on
K1
01.98 TNC 407/TNC 415/TNC 425
LE 407/415
X44/2
24V not
interruptible
+ -
k1
24 V
k3
PLC
Switch opens for a short time when control
voltage to each processor is turned on
X41/34
"Control is
ready"
EMERGENCY
STOP buttons
Control
voltage
on
X44/1 X42/4
24V Feedback
interruptible "Control ready"
k1
LE 234.003
X44/2
24V not
interruptible
+ -
k1
24 V
PLC
K1
1 PLC positioning module
X44/1 X42/4
24V Feedback
interruptible "Control ready"
k1
10-5