Siemens SINUMERIK 840Di - Page 345

06.03
10.5 Axes and spindles
10-345
 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 +/–”.
Notice
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
switches)
0 = brake characteristic is observed
1 = rapid deceleration with setpoint “0”
 Alarm: “21614 hardware limit switch [+/–]”.
2nd software
limit switch
plus
(activated in PLC)
1. software
limit switch
plus
Hardware
limit switch
plus
Mechanical
traversing end
plus
EMERGENCY
STOP
Working
area
limitation
plus
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
is exceeded.
It must be set such that the max. speed (rapid traverse) can be reached and, in
addition, a certain control margin remains.
Hardware
limit switches
Dynamic
monitoring
functions
Speed setpoint
monitoring
10 NC Start-U
p
with HMI Advanced