6 – 178 HEIDENHAIN Technical Manual TNC 426, TNC 430
Flowchart for:
n TNC 426 M (NC software > 280 476-06)
n TNC 430 M (NC software > 280 476-06)
X41/34
X42/4
176543289
Step Function Screen display
1 Waiting for machine control
voltage
RELAY EXTERNAL DC VOLTAGE
MISSING
2 Recognition of the machine
control voltage on X42/4 and
switch-off of the control-is-
ready signal on X41/34 by host
computer (t < 66 ms)
3 Maximum time within which
the control-is-ready
acknowledgment on X42/4
must go to zero (t < 380 ms)
If exceeded EMERGENCY STOP
DEFECTIVE
4 Recognition of the
acknowledgment and setting of
X41/34 (t < 20 ms)
5 Waiting for machine control
voltage
RELAY EXTERNAL DC VOLTAGE
MISSING
6 Normal control operation.
Control-is-ready output and
acknowledgment are high.
7 Control voltage is switched off
externally.
EMERGENCY STOP
8 After switching on again, the
machine control voltage can be
switched off, and then the
control operates normally.
9 After detecting a fault, the
control switches off the control-
is-ready output (X41/34).
Blinking error message
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