Omron CJ1W-ECT21 Operation Manual page 109

 Tmaster
The cycle time of the EtherCAT master is assumed to be the same as process data communication
cycle.
Use the process data communication cycle that is set in the EtherCAT master.
 Ts_resp
This is the time from when the message request is received until the EtherCAT Slave Unit completes
generating the response.
CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)
4 EtherCAT Communications
4
4 - 13