HEIDENHAIN TNC 335 Technical Manual - Manual (Page 204)

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TNC 360 5 EMERGENCY STOP Routine 4-107
5.1 Connection diagram
Under fault conditions the "control is ready" output should switch off the 24-volt supply. Because of
the enormous importance of this function this output is tested by the control every time the mains
power is switched on.
HEIDENHAIN recommends the following wiring:
This diagram represents a proposal for circuitry. The machine tool builder is responsible for
complying with applicable safety regulations.
+ -
Logic unit
After control voltage is switched on, the switch is opened
by each microprocessor for a short time.
X21/34 X24/2 X24/1 X22/4
"Control
is ready"
24V cannot
be switched
off 24V can be
switched off Acknowledgement
"Control is ready"
EMERGENCY STOP
buttons
Control
voltage
on
k1
k1
K1
24 V
PLC