EP1258-0502 Macrocycle time
The box requires a certain time for internal cyclic processing of the operations. Depending on the number of active channels and the configured MTSF, this results in an internal processing time in the range of several 100 µs.
The macrocycle time is to be regarded as the absolute lower limit for EtherCAT communication. The EtherCAT cycle time should be selected 10...20 % higher depending on the performance of the system. The macrocycle times listed in the table below have been determined empirically and should be regarded as guide values.
Number of activated channels | Macrocycle time, typ. | ||||
|---|---|---|---|---|---|
MTSF = 1 | MTSF = 2 | MTSF = 5 | MTSF = 10 | Compatibility mode | |
1 | 130 µs | 140 µs | 160 µs | 170 µs | 50 µs |
2 | 130 µs | 140 µs | 160 µs | 170 µs | 70 µs |
4 | 130 µs | 140 µs | 170 µs | 200 µs | 90 µs |
8 | 130 µs | 160 µs | 190 µs | 290 µs | 120 µs |
The actual macrocycle time occurring on the system should be checked during commissioning in CoE parameter 0xF900:08 "Cycle Time".
