Siemens SINUMERIK 840D sl Function Manual page 98

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Detailed description

2.1 Axis monitoring

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)

The hardware limit-switch monitoring is active after the control has ramped up in all modes.

Upon reaching the hardware limit switch, the following occurs:

• Alarm 21614 "Channel <Channel number> Axis <Axis identifier> Hardware limit switch

• 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

• The traversing keys of the affected machine axis are blocked based on the direction.

Software limit switch

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)

The software limit switches are active:

• immediately after the successful referencing of machine axis.

• in all operating modes.

Significance

Braking with the configured axial acceleration

Rapid stop (set velocity = 0)

<Direction>"

braked according to their configured braking behavior.

Basic logic functions: Axis monitoring, protection zones (A3)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

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