Delta C2000 Series User Manual page 514

Example 6: Sequence control
If the NC contact of Y2 in the interlocking control configuration of example 5 is put in series
with the Y1 circuit, so that it is an AND condition for actuation of Y1 (see figure below), not
only is Y1 a condition for the actuation of Y2 in this circuit, the actuation of Y2 will also stop
the actuation of Y1. This configuration confirms the actuation order of Y1 and Y2.
Example 7: Oscillating circuit
Oscillating circuit with a period of T+ T
The figure below shows a very simple ladder diagram. When starting to scan the Y1 NC
contact, because the Y1 coil has lost power, the Y1 NC contact will be closed. When the Y1
coil is then scanned, it will be electrified, and the output will be 1. When the Y1 NC contact is
scanned in the scanning cycle, because Y1 coil is electrified, the Y1 NC contact will be open,
the Y1 coil will then lose power, and the output will be 0. Following repeated scanning, the
output of Y1 coil will have an oscillating waveform with a period of T(On)+ T(Off).
Y1
Oscillating circuit with a period of nT+ T
The program of the ladder diagram shown below uses timer T0 to control coil Y1's electrified
time. After Y1 is electrified, it causes timer T0 to close during the next scanning cycle, which
will cause the output from Y1 to have the oscillating waveform shown in the figure below.
Here n is the timer's decimal setting value, and T is the clock cycle of the timer.
X0
T0
Example 8: Flashing circuit
The following figure shows an oscillating circuit of a type commonly used to cause an
indicator light to flash or a buzzers to buzz. It uses two timers to control the On and Off time
of Y1 coil. Here n1, n2 are the timing set values of T1 and T2, and T is the clock cycle of the
timer.
X1
Y1
X2
Y2
Y1
Y1
T0 Kn
TMR
Y1
16-22
X3
Y2
Y1
X4 Y1
Y2
Y1
T T
X0
Y1
nT
T