Detailed description
2.1 Axis monitoring
Basic logic functions: Axis monitoring, protection zones (A3)
32 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Parameterization
The braking behavior of the machine axis upon reaching the hardware limit switch is
configurable via the machine data:
MD36600 $MA_BRAKE_MODE_CHOICE (Braking behavior on hardware limit switch)
Value Significance
0 Braking with the configured axial acceleration
1 Rapid stop (set velocity = 0)
Effectivity
The hardware limit-switch monitoring is active after the control has ramped up in all modes.
Effect
Upon reaching the hardware limit switch, the following occurs:
• Alarm 21614 "Channel <Channel number> Axis <Axis identifier> Hardware limit switch
<Direction>"
• The machine axis is braked according to the configured braking behavior.
• If the axis/spindle is involved in interpolation with other axes/spindles, these are also
braked according to their configured braking behavior.
• The traversing keys of the affected machine axis are blocked based on the direction.
2.1.7.2 Software limit switch
Function
Software limit switches serve to limit the traversing range of a machine axis. Per machine
axis and per traversing direction, two (1st and 2nd) software limit switches are available:
MD36100 POS_LIMIT_MINUS (1st software limit switch minus)
MD36110 POS_LIMIT_PLUS (1st software limit switch plus)
MD36120 POS_LIMIT_MINUS2 (2nd software limit switch minus)
MD36130 POS_LIMIT_PLUS2 (2nd software limit switch plus)
By default, the 1st software limit switch is active. The 2nd software limit switch can be
activated for a specific direction with the PLC user program:
DB31, ... DBX12.2 / 12.3 (2nd software limit switch minus / plus)
Effectivity
The software limit switches are active:
• immediately after the successful referencing of machine axis.
• in all operating modes.
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