Parameterization - Siemens SINUMERIK 840D Function Manual

M3: Coupled axes
14.5 Generic coupling
When braking, the stop state 75 "brake request" and situation-dependent, the higher priority
stop states 22 "wait: spindle enable missing", 12 "wait for axis/spindle release" or 71 "wait for
enable, transformation axis" are displayed.
If the following axis is stationary as result of the "CP-SW limit stop", and cannot approach the
software limit switch any closer, then the following alarm is displayed:
10625 "%?C{channel %1: %}block %3 following axis/spindle %2 with CP-SW limit stop %4"
This means that up to the "final" stopping position, the situation can be somewhat relieved by
moving the following axis in the opposite direction.
Note
For the "CP-SW limit monitoring", coupling involves maintaining synchronous operation. As a
consequence, it cannot be guaranteed that the axis stops at precisely the correct position, if the
coupling rule is to be maintained. If the brake is to be transferred to the leading axes, and the
interpolators brake as required, then the leading axis comes to a standstill in front of the
software limit switch. The maximum distance to the software limit switch is then obtained from
the actual maximum acceleration rate of the following axes multiplied by the square of the
interpolation cycle time.
Retraction
The user is responsible for retraction.
For diagnostic purposes, there are:
● the stop state 75 "brake request"
(if an axis has a travel command, but stops or may not traverse as a result of a braking
request)
● and the system variables:
$AA_BRAKE_STATE (actual brake status)
$AA_BRAKE_CONDB (context-sensitive conditions for the interpolator stop in the BCS)
$AA_BRAKE_CONDM (context-sensitive conditions for the interpolator stop in the MCS)
including the OPI variables aaBrakeState, aaBrakeCondB and aaBrakeCondM derived
from these.
Example for retraction:
1. acknowledge alarm 10625.
2. Switch to the JOG mode.
3. Traverse the leading axis using the traversing keys so that the following axis moves away
from the software limit switch.
14.5.11.2

Parameterization

Activation
The "CP SW limit monitoring" function is activated on an axis-for-axis basis using machine data:
554
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA