Siemens 6ED1050-1AA00-0BE8 User Manual

LOGO!
Manual, 04/2011, A5E03556174-01

349

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 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.

3DU

2XWSXW4[RU
RWKHUIODJ0[

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.

*B7 V

2II

3UHVV

Ⴇ

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

mode, view the trigger parameters.

2II

WRWDORIPHDVXUHGSXOVHVSHU

WLPHEDVH*B7

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