Script for adding an EtherCAT domain.
Adds an EtherCAt domain.
Anders Sandström
EXE_RATE (optional) Execution rate [cycles] defaults 0 (same EC_RATE)
EXE_OFFSET (optional) Execution offset cycles [cycles] defaults 0
ALLOW_OFFLINE (optional) Allow domain to be offline defaults 0
All EtherCAT entries generated after this command will be assigned