QUESTION:  
How can you get an axis back into the working range after it has overrun a hardware limit switch?

ANSWER:  
When a hardware limit switch is overtraveled, ErrorID 804B or 8013 is displayed in the relevant technology data block and "ErrorStatus.LimitSwitchActive" is set to TRUE. Proceed as follows:

• Call the MC_Reset with Restart = FALSE; all error messages are retained. 
• Retract the axis from the hardware limit switch; all error messages are retained even when the axis has left the limit switch. 
• Call the MC_Reset again with Restart = FALSE; the error messages are acknowledged in the technology data block and "ErrorStatus.LimitSwitchActive" is reset.

Note:
More information is available in the manual "S7 Technology", sections 4.5.7 and 4.6.11 "Limits" in Entry ID: 30119663.