Hitachi MICRO-EHV+ Applications Manual page 110

Chapter 3 Programming
Cycle (interval) time of EtherCAT master
Recommended : Declaration in EtherCAT I/O mapping
Not recommended : Declaration in POU and referred from EtherCAT I/O mapping
Following information is based on our slave controller EH-IOCA.
Declaration in EtherCAT I/O mapping is about two times faster than declaration in POU.
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EtherCAT cycle time depends on the total size of EtherCAT slaves. It increases about 70s/word.
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EtherCAT cycle time depends on the number of EtherCAT slaves. It increases about 700s/unit.
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