5.2 Flow-diagram
The external electronics must meet the specified conditions. In particular, the acknowledgement for
"Control ready" must reach the TNC 415 after a maximum of 114 ms (for the TNC 407: 146 ms) .
5.2.1 TNC 415
X41/34
X42/4
1
2
3
1.
Wait for control voltage.
2.
Recognize the control voltage on X42/4 and switch-off
of the control-is-ready signal on X41/34
by the first microprocessor (t < 66 ms).
3.
Maximum time during which the acknowledgement of
Control readiness on X42/4 must go to 0 (t < 114 ms).
If exceeded
4.
Recognize the acknowledgement and set X41/34
(t < 20 ms).
5.
Wait for control voltage.
6.
Recognize the control voltage on X42/4 and switch-off
of the control-is-ready signal on X41/34
by the second microprocessor (t < 66 ms).
7.
Maximum time during which the acknowledgement of
control readiness on X42/4 must go to 0. (t < 114 ms).
If exceeded
8.
Recognize the acknowledgement and set X41/34
(t < 20 ms).
9.
Wait for control voltage.
10. Recognize the control voltage on X42/4 and switch-off
of the control-is-ready signal on X41/34
by the third microprocessor (t < 66 ms).
4-122
TNC 407/TNC 415/TNC 425
4 5 6
7
8 9 10 11 12 13
5 EMERGENCY STOP-routine
14
15
16
17
VDU display
RELAY EXT. DC VOLTAGE
MISSING
EMERGENCY STOP DEFECTIVE
RELAY EXT. DC VOLTAGE
MISSING
EMERGENCY STOP DEFECTIVE
RELAY EXT. DC VOLTAGE
MISSING
01.98