Axis Monitoring (A3)
2.4 Monitoring of static limits
Turning, Milling, Nibbling
52 Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Effectiveness
● Software limit switch monitoring is activated after reference point approach in all modes.
● The position of the software limit switch can be approached.
● The 2nd software limit switch can be activated via the "2nd software limit switch
plus/minus" interface signal (V380x 1000.3 or .2) from the PLC. The change becomes
active immediately. The 1st software limit switch plus/minus is then de-activated.
● The SW limit switch monitoring does not function for endlessly turning rotary axes, i.e. if
MD30310 ROT_IS_MODULO = 1. (Modulo conversion for rotary axis and spindle)
Effect/reactions
Depending on the mode, different responses to an attempted software limit switch violation
are possible:
AUTO, MDA:
● The block that would violate the software limits switches is not started. The previous block
is terminated properly.
● Program execution is terminated.
● Alarm 10720 "Software limit switch + or -" is signaled.
JOG:
● The axis stops at the software limit switch position.
● Alarm 10621 "Axis at software limit switch + or -" is signaled.
● The direction keys in the approach direction are disabled.
Note
Switching over the software limit switch:
If the current position lies behind the new software limit switch when the software limit switch
is switched over, the axis is decelerated with the maximum permissible axial acceleration. If
an axis is involved in interpolation with other axes, these are also decelerated. A contour
violation may occur.
Remedy
● Reset
● Move in the opposite direction (in JOG mode)
● Correct the program
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