HEIDENHAIN TNC 122 Technical Manual - Manual (Page 35)

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TNC 122 9 Machine Integration 4/97
9.7.1 EMERGENCY STOP Connection Diagram
In case of a malfunction, the control-is-ready output should switch the 24 V supply voltage off.
Because this function is so critical, the TNC 122 checks this output each time the power supply is
switched on.
HEIDENHAIN recommends the following wiring:
+ -
TNC 122
Switch opens briefly when the control voltage
of each microprocessor is switched on
X41/10 X41/9 X41/28
"Control is
ready"
24V not
interruptible "Control ready"
feedback
EMERGENCY
STOP
buttons
Control
voltage
on
k1
k1
K1
24 V
PLC
If the control is not to be part of the EMERGENCY STOP circuit, output X41/10 must be short-
circuited with input X41/28.