System Performance

Bus Communication

The ETHERCAT communication is realised using 100Mbit. There is one telegram for all ETHERCAT slaves in a segment, so overhead is substantially reduced.

The clamp-to-clamp response time depends on the size of the total process image of all slaves and the CPU load of PLC.

Clamp-to-Clamp Response Times of the \ CI511-ETHCAT/CI512-ETHCAT

The clamp-to-clamp response times for digital I/Os of CI51x-ETHCAT is 2 bus cycles (e.g. 2 ms with bus cycle time set to 1 ms) with the CPU PM591, ETHERCAT distributed clock activated and synchronized task type (triggered by external event). The clamp-to-clamp response times for analog I/Os is about 13 ms for bus cycle time of 1 ms.

Note

50 % CI511-ETHCAT and 50 % CI512-ETHCAT means e. g. that in case of 16 devices, 8 CI511-ETHCAT and 8 CI512-ETHCAT are involved.