Determining the cycle time

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

The time required for a program cycle can be determined using a short test program. This test program is created in LOGO! and returns a value during its execution in parameter assignment mode from which the current cycle time is derived.

Test program

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

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2.Configure the threshold trigger as shown below. A pulse is generated in each program cycle due to the inverted flag. The trigger interval is set to 2 seconds.

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

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4.The reciprocal value of fa is equivalent to the LOGO! execution time of the current circuit program in its memory.

1/fa = cycle time in s

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Siemens 6ED1050-1AA00-0BE8 manual Determining the cycle time, Id , Test program
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