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The term cycle time may initially appear confusing for a logic relay. If however, you consider that the method of operation of a logic relay corresponds with that of a programmable controller (PLC) when executing a user defined logical sequence, based on a circuit diagram and not on hardwired logic with negligible transfer times, it is possible to explain why the inputs only have an effect on the actions of the outputs after a processing time.

Inputs are connected to the microprocessor by their interface connection, which maps them with the support of software and which provides them to the mapper in accordance with the processing sequence, and which produces output maps after processing, which are then passed on collectively to the outputs.

The time required by the microprocessor to complete this continuously repeating cyclic process is comparable to the »cycle time« defined for a PLC.

It depends on a multitude of system dependant parameters which are listed in the user manual AWB 2528-1304 GB from Moeller on pages 196 and 197.

Screenshot (EASY-SOFT 3.1): menu point »Options->Calculate cycle time..«

Easy-Soft V3.1 uses these tables consistently with all circuit diagrams. The theoretical cycle time of the current circuit diagram can be read off via the »Options->Calculate cycle time...«. The inverse value is also simultaneously recognisable as a frequency. It should however be treated with caution.

Screenshot (EASY-SOFT 3.1): »Cycle time« dialog

Two processing cycles should be applied in order to guarantee the reaction of an output to the change on an input, so that the stated frequency must be halved, if a clear statement concerning the true reaction time is to be made.