ELC Programming Manual
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Example 6- Interlock control
X3
Y1
X1
Y1
X4
Y2
X2
Y2
Y1
Y2
X1
X3
X2
X4
Y1
Y2
NC contact Y1 is connected to the Y2 output circuit and the NC contact Y2 is connected to the Y1
output circuit. If Y1 is ON, Y2 will be OFF and vice versa. This forms an Interlock circuit which
prevents both outputs from being ON at the same time. Even if both X1 and X2 are ON, in this
case only Y1 will be enabled.
Example 7 - Sequential Control
X3
Y1
X1
Y1
X4
Y2
X2
Y2
Y1
Y2
Connect the NC contact Y2 to the Y1 output circuit
and the NO contact Y1 to the Y2 output circuit. Y1
becomes one of the conditions to turn on Y2. In
addition, Y1 will be OFF when Y2 is ON, which
forms a sequential control process.
Example 8 - Oscillating Circuit
An oscillating circuit with cycle time ΔT+ΔT
Y1
Y1
Y1
T T
In the first scan, Y1 turns on. In the second scan, Y1 turns off due to the reversed state of contact
Y1. Y1 output status changes in every scan and forms an oscillating circuit with output cycleΔ
T(ON)+ΔT(OFF)
Example 9 – Oscillating Circuit with Timer
An oscillating circuit with cycle nT+ΔT
T0
X0
TMR
Y1
Y1
T0
Kn
Y1
TTn
X0
When X0 = ON, T0 starts timing (nT). Once the set time is reached, contact T0 = ON to enable
Y1(ΔT). In next scan, Timer T0 is reset due to the reversed status of contact Y1. Therefore contact
T0 is reset and Y1 = OFF. In next scan, T0 starts timing again. The process forms an oscillating
circuit with output cycle nT+ΔT.
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