Siemens SINUMERIK 840D sl Function Manual page 253

Difference < .. TOL_COARSE
As long as the synchronous traverse difference is smaller than the following machine data, IS
"Coarse synchronism" DB 31, ... DBX 98.1 is at the interface and IS "Fine synchronism" DB
31, ... DBX 98.0 is deleted.
MD37200 $MN_COUPLE_POS_TOL_COARSE
Difference > .. TOL_FINE
If synchronous traverse 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
Difference in synchronism for EG cascades
Deviation in synchronism for EG cascades is the deviation of the actual position of the
following axis from setpoint position that results fro the rule of motion for the real axes
involved.
Example:
Figure 5-8 Three-level EG cascade
According to the definition given, the difference in synchronism of following axis FA3 in the
example below is determined by the value of following axis FA3
axis FA2
If FA2 is not a real axis, the actual value FA2
the axis derived solely from the leading axis value FA1
value of the setpoint of the axis.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
and LA2 , but not by LA1
Act Act
and FA1 .
Act Act
is not available. In this case, the setpoint of
Act
must be used instead of the actual
Act
M3: Coupled axes
5.4 Electronic gearbox (EG)
and the value of leading
Act
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