Capture function configuration

Role of the capture function

This function is used to sample the value of the position of the on detection of an event. The function has no impact on the axis values, nor on the processor.

Implementing this function enables the application to manage the process better, for example control of: the number of pulses sent by the , the size of the parts, the of the axis, the entry angle of the parts.

The module has:

2 physical capture inputs Icapt0 and Icapt1,
4 register words that can be accessed via the sequential program:
- 0 Registers: always store the actual position value of the angle (CAPT0_ANG) and the number of turns (CAPT0_TURN). The capture function always operates on detection of a rising input front Icapt0.
- 1 Registers: the values captured in these registers (CAPT1_ANG and CAPT1_TURN) depend on the type of capture requested (see table below).

Procedure

The type of capture is chosen via a pull-down menu (only the first 2 choices can be accessed for an absolute encoder):

If you require capture on detection of a rising edge on the Icapt0 input (for 0 registers) and ...	then select...
a falling edge on the Icapt0 input (for 1 registers) (E.g.: measure the size of the parts, in comparison with 0 registers)	Capt1 on falling edge of Icapt0.
a rising edge on the Icapt1 input (for 1 registers) (E.g.: measure the entry angle of the parts)	Capt1 on rising edge of Icapt1.
storage of the number of pulses in the 1 registers on each encoder turn (E.g.: to check the encoder link)	Capt1 = Number of pulses per encoder turn.
capturing the value of the angle before recalibration in the 1 registers (E.g.: to evaluate the deviation due to the slip and corrected by the recalibration)	Capt1 before recalibration.
of a rising edge on zero pulse marker input (for 1 registers) (E.g.: to evaluate the deviation due to the slip, without recalibrating the axis)	Capt1 on rising edge of zero marker

Capture

A module function that is used to sample the position value of the axis on detection of a precise event (input Icapt0 and/or Icapt1). The capture has no impact on the values of the axis nor on the cam processor.

The implementation of this function allows the application to manage the process better, for example: in monitoring the number of pulses sent by the encoder, the size of the parts, the axis slip, the angle of arrival of the parts.

Recalibration

This is the module function which is used to adjust the axis in relation to the machine zero or to synchronize the axis in relation to the arrival of a part.

Recalibration forces the position reading to a value which is predefined by the "recalibration value" parameter (included in the pulse field of the cycle).

The module allows recalibration to be carried out systematically for each cycle or for only one cycle. This recalibration is always conditioned to the IREC input.