DSM Hard Stop/Soft Stop

A hard stop occurs when one of the memory column axes physically reach the end of travel and can go no further. A soft stop occurs when the column stops before it physically reaches the end of travel. The hard stop is set by column design and cannot be changed or adjusted. The soft stop is set by the DSM. The memory column axes are up/down. To prevent unnecessary stress on the column and motors, the DSM sets soft stop positions, 2 for each moving axis. The DSM uses a preset distance from the hard stop to determine where the soft stop occurs. When an axis reaches the hard stop and the switch is held for approximately one second, the DSM briefly reverses direction and establishes the soft stop for that axis in that direction. The DSM uses this back up strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction.