Touch Probe

Functional description

The "Touch Probe" function implemented in the EJ7411 provides the user with the possibility to save the current position of the connected motor at a defined point in time. In the tab Process data the necessary inputs and outputs can be added.

The EJ7411 EtherCAT plug-in module has two digital inputs that can be used for the "Touch Probe" function. Each Touch Probe input can only detect edges of one direction at any time (rising or falling). It is not possible to react to both edges at the same time. However, there are no dependencies between the inputs (i.e. TP1 rising edge and TP2 falling edge is allowed).

The abbreviation TP1 stands for Touch Probe 1 and is linked to input 1 (pin 31). The abbreviation TP2 stands for Touch Probe 2 and is linked to input 2 (pin 32). TP1 is used here as an example for the description of the function. The C-track of the incremental encoder can be selected via the CoE parameter 0x8001:11 "Touch probe 1 source" or 0x8001:12 "Touch probe 2 source " with the value"Hardware zero impulse (5)" as Touch probe trigger. However, this is not possible with the "Drive Motion Control" operation mode.

Touch Probe 1:
Touch Probe inputs
Touch Probe 2:
Touch Probe outputs

Step-by-step