HEIDENHAIN TNC 335 Technical Manual - Manual (Page 205)

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TNC 360 5 EMERGENCY STOP Routine 8/95
5.2 Flow diagram
The external electronics must meet the specified conditions. In particular, the acknowledgment for
"Control is ready" must reach the TNC 360 after a maximum of 146 ms.
X21/34
X22/4
1 2 3 4 5 6 7 8 9
VDU display
1. Wait for control voltage. RELAY EXT. DC VOLTAGE
MISSING
2. Recognize the control voltage on X22/4 and switch-off
of the "Control is ready" signal on X21/34 (t < 70 ms).
3. Maximum time during which the acknowledgment of
"control is ready" on X22/4 must go to 0 (t < 146 ms).
If exceeded EMERGENCY STOP DEFECTIVE
4. Recognize the acknowledgment and set X21/34
(t < 20 ms).
5. Wait for control voltage. RELAY EXT. DC VOLTAGE
MISSING
6. Normal control operation. Output and acknowledgment
"control is ready" are high.
7. Machine control voltage is switched off externally EMERGENCY STOP
8. After switching on the control voltage again, the
error message can be canceled, followed by
normal control operation.
9. The control switches off the output "control is ready" Flashing error-
(X21/34) after recognizing a fault. message