HEIDENHAIN TNC 426 PB - Page 506

6 – 176 HEIDENHAIN Technical Manual TNC 426, TNC 430
Flowchart for:
n TNC 430 CA/PA
n TNC 426 M/30 000 rpm (NC software < 280 476-06)
n TNC 430 M (NC software < 280 476-06)
X41/34
X42/4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
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 Recognition of the machine
control voltage on X42/4 and
switch-off of the control-is-ready
signal on X41/34 by DSP 1
(t < 120 ms)
7 Maximum time within which the
control-is-ready acknowledgment
on X42/4 must go to zero (t < 380
ms)
If exceeded
EMERGENCY STOP DEFECTIVE
8 Recognition of the
acknowledgment and setting of
X41/34 (t < 120 ms)
9 Waiting for machine control
voltage
RELAY EXTERNAL DC VOLTAGE
MISSING
10 Recognition of the machine
control voltage on X42/4 and
switch-off of the control-is-ready
signal on X41/34 by DSP 2
(t < 120 ms)