Siemens sinumerik 840D sl Function Manual page 286

Detailed description
2.4 Electronic gearbox (EG)
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 2-8 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.
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,
IS "Enable following axis override" DB31, ... DBX26.4
In the case of the commands EGON() and EGONSYNE(), the "Enable following axis
override" signal must be present for the gear to synchronize to the specified synchronization
position for the following axis. If it is not present, alarm 16771 "Override movement not
enabled" is issued. If the signal is present, the following axis travels to the synchronized
position with the calculated acceleration and at the velocity set for the approach mode.
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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
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
and the value of leading
Act