Hitachi EH-D6EAN - Page 110

Chapter 3 Programming
3 – 50
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.
 EtherCAT cycle time depends on the total size of EtherCAT slaves. It increases about 70s/word.
 EtherCAT cycle time depends on the number of EtherCAT slaves. It increases about 700s/unit.