Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
MD36130: POS_LIMIT_PLUS (2nd software limit switch plus)
IS: DB31,... DBX12.2 (2nd software limit switch minus)
IS: DB31,... DBX12.3 (2nd software limit switch plus)
Alarm: "10620 Axis reaching software limit switch +/–"
Alarm: "10621 Axis is at software limit switch +/– (JOG)"
Alarm: "10720 Progr. end point is behind software limit switch +/–".
All position monitoring functions are only active with valid reference point of the
corresponding reference point of the machine axis.
If the PLC signals that a hardware limit switch has been reached, the machine
axis is stopped with the parameterized brake response.
IS: DB31, ... DBX12.1 (hardware limit switch plus)
IS: DB31, ... DBX12.0 (hardware limit switch minus)
MD 36600: BRAKE_MODE_CHOICE (brake response at the hardware limit
0 = brake characteristic is observed
1 = rapid deceleration with setpoint "0"
Alarm: "21614 hardware limit switch [+/–]".
(activated in PLC)
Fig. 10-21 Overview of end limitations
The dynamic monitoring functions with reference to a machine axis are:
The speed setpoint monitoring prevents that the max. admissible motor speed
It must be set such that the max. speed (rapid traverse) can be reached and, in
addition, a certain control margin remains.
10 NC Start-Up with HMI Advanced
10.5 Axes and spindles