ABB 615 Series ANSI, Техническое руководство

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Section 10
1MAC050144-MB C
Other functions
618 615 series ANSI
Technical Manual
10.4 Time delay off timers, TOF
10.4.1 Function block
Figure 328: Function block
10.4.2 Functionality
The time-delay-off function block TOFGAPC can be used, for example, for a
drop-off-delayed output related to the input signal. TOFGAPC contains eight independent
timers. There is a settable delay in the timer. Once the input is activated, the output is set
immediately. When the input is cleared, the output stays on until the time set with the
Off
delay time setting has elapsed.
Figure 329: Timer operation
t
0
t
1
+dt t
2
t
3
t
5
+dt
dt = Off delay time
t
1
t
4
t
5