This is a PLC Program for Positive edge pulse output for one scan cycle. Learn the ladder logic with the solution.
Problem Description
In some applications, we need to run an operation/function based on external input signal. We can use a digital input as trigger command to activate that required function.
Sometimes we use positive transition of the digital input signal to trigger the command instead of continuous/full pulse digital input signal.
Here we consider an example of simple logic in which two registers values will be increment after receiving the trigger command. Each register have a preset value say value “1”. So on every trigger command, the adder register values will be increment by value “1”.
For adder 1 register we use positive edge (0 to 1) triggered input and for adder 2 register we use simple digital input (0 to 1 & 1 to 0) signal. We see the advantages and disadvantages of using triggering command with and without using positive edge.
We can use the same logic in other applications like Zeroing the register values, forcing the register values with defined value with little logic modification etc.
The initial value of “Adder 1″register is zero. After giving positive edge triggering command for 18 times, the output will be value 18 as it increments by value “1”.
Simulation (PLCSIM-300) for trigger command with positive edge.
The initial value of “Adder 2″register is zero. After giving triggering command (without positive/negative edge) for 18 times, the output will come some random number (say 7506) instead of value 18 as trigger command directly received.
Simulation (PLCSIM-300) for trigger command without positive edge.
Note: The above PLC Logic provided for basic idea about application of Positive edge trigger command in PLC Logic. The Logic is limited and not complete application.
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