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6 – 178
Flowchart for:
n
TNC 426 M (NC software > 280 476-06)
n
TNC 430 M (NC software > 280 476-06)
Step
Function
1
Waiting for machine control
voltage
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)
4
Recognition of the
acknowledgment and setting of
X41/34 (t < 20 ms)
5
Waiting for machine control
voltage
6
Normal control operation.
Control-is-ready output and
acknowledgment are high.
7
Control voltage is switched off
externally.
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).
Screen display
RELAY EXTERNAL DC VOLTAGE
MISSING
If exceeded EMERGENCY STOP
DEFECTIVE
RELAY EXTERNAL DC VOLTAGE
MISSING
EMERGENCY STOP
Blinking error message
HEIDENHAIN Technical Manual TNC 426, TNC 430
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