Software limit switches

Software limit switches are used to limit the travel range of an axis. Monitoring of the software limit switches can be activated and configured in the configuration menu of the software module during startup. The drive must be referenced to enable monitoring of the software limit switches.

If software limit switch monitoring is enabled, the following response will be triggered depending on the active operating mode as soon as the configured positive or negative limit switch position is exceeded:

• Jog – position-controlled (100)
• The drive stops at the software limit switch position with the deceleration specified via the table position. If "Limit switch error response" is enabled, the error message E30.01/02 "Positive/negative limit switch reached" is issued.
• Jog – speed-controlled (101) and speed (200)
• The drive stops with the configured emergency stop ramp if the relevant "Limit switch error response" is enabled. The error message E30.01/02 "Positive/negative limit switch hit" is issued.
• Positioning (400 – 404)
• If a target position is specified that lies beyond the position of a software limit switch, no travel order will be performed when the motor is at standstill. Otherwise, the drive stops with the deceleration set for the application limits. The error message E19.02 "Position setpoint violation" is issued.

Error messages can be reset using PO 1.8 "Fault reset". First, specify a direction of rotation or a target position in the direction of the valid range of the software limit switches. If you wish to move the drive outside the range limited by the software limit switches, you have to deactivate the software limit switches using the PO 1:12 signal.