Signals From Axis/Spindle (Db31 - Siemens SINUMERIK 840D sl Function Manual

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Table of Contents

DBX12.2 - DBX12.3

2nd software limit switch plus or minus

Signal state 0 or

1st software limit switch for the plus and minus directions is effective.

2nd software limit switch for the plus and minus directions is not effective.

Corresponding to ...

MD36110 $MA_POS_LIMIT_PLUS (1st software limit switch plus)

MD36130 $MA_POS_LIMIT_PLUS2 (2nd software limit switch plus)

MD36100 $MA_POS_LIMIT_MINUS (1st software limit switch minus)

MD36120 $MA_POS_LIMIT_MINUS2 (2nd software limit switch minus)

Signals from axis/spindle (DB31, ...)

DBX60.2 - DBX60.3

Encoder limit frequency exceeded 1

Encoder limit frequency exceeded 2

Edge evaluation: No

Signal state 1

The limit frequency set in the machine data:

MD36300 $MA_ENC_FREQ_LIMIT (encoder limit frequency)

has been exceeded.

The reference point for the position measuring system involved has been lost (IS: Referenced/

synchronized has a signal state 0). Closed-loop position control is no longer possible. Spindles con‐

tinue to run with closed-loop speed control. Axes are stopped with a fast stop (with open-circuit

position control loop) along a speed setpoint ramp.

Signal state 0

The limit frequency set in machine data:

MD36300 $MA_ENC_FREQ_LIMIT

is no longer exceeded.

For the edge change 1 → 0, the encoder frequency must have fallen below the value of machine data:

MD36302 $MA_ENC_FREQ_LIMIT_LOW (encoder limit frequency for encoder resynchronization)

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Signal(s) updated: Cyclically

Z1: NC/PLC interface signals

19.2 Axis monitoring, protection zones (A3)

Sinumerik 828d Sinumerik 840de sl