Free-large Mode Principle Description
The Free-large mode can be used for axis monitoring or labeling in cases where the incoming position of each part has to be known.
In the Free-large mode, quadrature is supported.
When counting is enabled, the counter counts as follows in:
Incrementing direction: the counter increments.
Decrementing direction: the counter decrements.
With a Main type, on the rising edge of the Sync condition, the counter is activated and the current value is set to the preset value.
The current counter is stored in the capture register by using the Capture function.
If the counter reaches the counting limits, the counter will react according to the Limits Management configuration.
The table shows the 4 types of input modes available:
|
Input Mode |
Comment |
|---|---|
|
Normal Quadrature X2 |
A physical encoder always provides 2 signals 90° shift that first allows the counter to count pulses and detect direction: oX2: 2 counts by Encoder cycle oX4: 4 counts by Encoder cycle |
|
Normal Quadrature X4 |
|
|
Reverse Quadrature X2 |
|
|
Reverse Quadrature X4 |
The encoder signal is counted according to the input mode selected, as shown below:
The figures shows the affect of the inputs on the counter value for Normal Quadrature:
|
Stage |
Action |
|---|---|
|
1 |
On the rising edge of Sync input, the current value is set to the configured preset value. |
|
2 |
When Enable condition = TRUE, each pulse pair with leading edge on A increments the counter value. |
|
3 |
On the rising edge of Preset condition, the current value is set to the configured preset value. |
|
4 |
When Enable condition = TRUE, each pulse pair with leading edge on B decrements the counter value. |
|
5 |
When Enable condition = FALSE, the all further pulses are ignored. |
|
6 |
On the rising edge of Sync input, the current value is set to the configured preset value. |
|
7 |
When Enable condition = TRUE, the pulse pair with leading edge on B decrements the counter value. |
