Siemens SINUMERIK 840D Function Manual page 471

Difference < .. TOL_COARSE
As long as the synchronism difference is smaller than the following machine data, IS "Coarse
synchronism" DB 31, ... DBX 98.1 is at the interface and IS "Fine synchronism" DB31, ...
DBX99.4 is deleted:
MD37200 $MN_COUPLE_POS_TOL_COARSE
Difference > .. TOL_FINE
If the synchronism difference is smaller than the following machine data, then NST
"synchronous traverse fine" DB31, ... DBX98.0 is at the interface:
MD37210 $MA COUPLE_POS_TOL_FINE
Synchronism difference for EG cascades
Synchronism difference for EG cascades is the deviation of the actual position of the following
axis from setpoint position that results for the rule of motion for the real axes involved.
Example:
Figure 14-8 Three-level EG cascade
According to the definition given, the synchronism difference of following axis FA3 in the
example below is determined by the value of following axis FA3
FA2
If FA2 is not a real axis, the actual value FA2
axis derived solely from the leading axis value FA1
of the setpoint of the axis.
Other signals
If an EGON(), EGONSYN() or EGONSYNE() block is encountered in the main run, the signal
"Coupling active" is set for the following axis. If the following axis is only overlaid, the signals
"Coupling active" and "Axis override" are set. If EGON(), EGONSYN() or EGONSYNE() is
active and the following axis is also overlaid, the signals "Coupling active" and "Axis override"
are also set.
IS "following spindle active" DB31, ... DBX 99.1: Coupling active,
IS "overlaid movement" DB31, ... DBX98.4: axis is overlaid,
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
and LA2 , but not by LA1
Act Act
and FA1 .
Act Act
is not available. In this case, the setpoint of the
Act
must be used instead of the actual value
Act
M3: Coupled axes
14.4 Electronic gear (EG)
and the value of leading axis
Act
471