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6. APPLICATION FUNCTIONS
6.8 Limit switch (stroke end)
When the limit switch signal corresponding to the movement direction is turned off, an alarm occurs and
movement is stopped.
The deceleration time constant used for stopping by the limit switch is the rapid stop time constant.
(Note 2, 3)
side limit switch
(LSP)
ON
OFF
ON
OFF
(Note 5)
Rapid stop
time constant
(Note 1)
(Note 4)
Operation is not resumed.
Speed limit value
Command speed
During smoothing of
stopping (SMZ)
Note 1. Even if the limit switch signal is turned back on, operation does not resume.
2. The limit switch signal is a signal that is input through the servo amplifier or something similar.
The method for inputting an external signal can be set up using sensor input options (parameter No.0219).
3. The limit switch signal is a normally-closed contact.
4. If operation stopped by the limit switch during linear interpolation operation or automatic operation, they do
not turn on the positioning complete signal (PF).
5. If smoothing filter is set, the smoothing filter time constant is always valid. Therefore, rapid stop as well will
use smoothing filter.
If the servo is stopped with the limit switch in the off position (prohibited area), the servo can be moved in the
movement allowed area. However, execute start operation, after resetting the alarm that has been set.
Current command position
Limit switch
Movement
prohibited
Prohibited area
(OFF)
Movement allowed
area (ON)
Movement allowed
API LIBRARY
• Use the sscGetIoStatusFast function to check if limit switch (LSP or LSN) is
ON/OFF.