User Manual

LOGO!

Manual, 06/2014, A5E33039675

319

Determining the cycle time

The program cycle is the complete execution of the circuit program, that is, primarily the

reading in of the inputs, the processing of the circuit program and the subsequent writing the

outputs. The cycle time is the time required to execute a circuit program once in full.

You can determine the time required for a program cycle using a short test program. Create

this test program in LOGO! to return a value from which you can calculate the cycle time.

Test program

To program this test program, follow these steps:

1. Create the test program by linking an output to a threshold trigger and connecting the

trigger input with an inverted flag.

2. Configure the threshold trigger as shown below. LOGO! generates a pulse in each

program cycle due to the inverted flag. The trigger interval is 2 seconds.

3. Now start the circuit program and switch LOGO! to parameter assignment mode. In this

mode, view the trigger parameters.

4. The reciprocal value of f

is equivalent to the LOGO! execution time of the current circuit

program in its memory.

1/f

= cycle time in s