Different execution time of function block AIN1 and AIN2

Question:
Why does function block AIN2 has a longer execution time than AIN1?

Answer:
The execution time, which is entered in the processing table for function block  AIN1, is 10 µs. For function block AIN2 this time is, however, 28 µs. The difference is in the second extended function of the second analogous input: While function block AIN1 is read in a cycle time of 1 ms, the cycle time for reading function block AIN2 is only 250 µs.

This function can be used, when a servo controller is solely used as torque controller, e. g. when an external control is used as speed controller. The torque setpoint supplied by the control is directly transmitted to MCTRL-MADD via AIN2 and is therefore dynamically available  every 250 µs at the current controller.

In the signal path between AIN2-OUT and MCTRL-M-ADD no further function blocks are allowed!

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/200405950/1/