Reversion of rotation

• With an encoder, the counting direction is determined by the phase position of the signals on tracks A and B.
• Forward (cw): Signal on track A leads track B by 90°
• Reverse (ccw): Signal on track A lags track B by 90°

To adapt the counting direction to the application, this logic can be inverted by setting the bit in index 0x80n0:0E "Reversion of rotation".

Fig.153: Reversion of counting direction (Index 0x80n0:0E "Reversion of rotation") for an encoder

• With a counter/pulse generator the counting direction is determined by the level at track B.
• Forward (cw): LOW level at track B or input open
• Reverse (ccw): HIGH level at track B

Setting the bit in index 0x80n0:0E "Reversion of rotation" also inverts the logic of the counting direction. An overview of the resulting counting direction is shown in the following table.

The current level at input B is displayed via process data 0x60n0:0A "Status of input B".

Fig.154: Reversion of counting direction (Index 0x80n0:0E "Reversion of rotation") for a counter/pulse generator