Siemens SINUMERIK 802D sl Function Manual page 88

Gantry axes (G1)
6.2 "Gantry axes" function
When the "gantry axes" function is active, the synchronized axis setpoint is generated
directly from the setpoint of the leading axis in all operating modes.
Note
The dynamic control response settings for the leading and synchronized axes must be
identical.
Monitoring the actual value difference
The position actual values of the leading and synchronized axes are continuously compared
with one another in the interpolation clock cycle and monitored to check that they are still
within the permissible tolerance range.
Machine data can be set to specify the following limit values for alarm output and termination
of the traversing motion for specific axes:
Gantry warning limit
The "Warning limit exceeded" warning will be relayed to the operator when the actual
position value difference exceeds the gantry warning limit:
MD37110 GANTRY_POS_TOL_WARNING (gantry warning limit)
In addition, the following interface signal will be output to the PLC:
V390x 5005.3 (gantry warning limit exceeded)
When below the warning limit, the message and interface signal will automatically be
cancelled.
When MD37110 = 0 the message will be disabled.
Gantry trip limit
Alarm 10653 "Error limit exceeded" will be signaled when the machine's maximum
permissible actual position value deviation is exceeded:
MD37120 GANTRY_POS_TOL_ERROR (gantry trip limit)
In order to prevent any damage to the machines, the gantry axes will be immediately shut
down via the break ramp.
The value of MD37120 is applied when the gantry grouping is synchronized.
The alarm must be acknowledged with "RESET".
In addition, the following interface signal will be output to the PLC:
V390x 5005.2 (gantry trip limit exceeded)
If the gantry axis grouping has not yet been synchronized, the limit value for the gantry trip
limit is derived from the following machine data:
MD37130 GANTRY_POS_TOL_REF (gantry trip limit for referencing)
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Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0