Siemens SINUMERIK 840D Function Manual page 533

Sequence
Starting
The second stage of the synchronous operation monitoring function starts with active coupling
as soon as the following conditions are fulfilled:
● The setpoint synchronous operation is reached:
DB31, ... DBX99.4 (synchronization running) = 0
● The actual value related "coarse"/"fine" synchronous operation of the tolerance of the first
stage of the synchronous operation monitoring (see "Synchronism monitoring stage 1
(CPSYNCOP, CPSYNFIP, CPSYNCOV, CPSYNFIV) (Page 527)") is reached:
DB31, ... DBX98.1 (coarse synchronous operation) = 1 / DB31, ... DBX98.0 (fine
synchronous operation) = 1
Monitor
As long as the synchronism difference of the actual the threshold values for "fine" 2 position
synchronous operation and "coarse" 2 position synchronous operation are not exceeded, the
following NC/PLC interface signals are set:
DB31, ... DBX103.4 (synchronous operation 2 fine)
DB31, ... DBX103.5 (synchronous operation 2 coarse)
If, due to temporary overload in machining process (e.g. infeed feedrate for multi-edge
machining too high), the following axis/spindle can no longer follow the specifications of the
leading axis(n)/spindle(s) and the deviation is greater than the set tolerance, the violation of the
"fine"/"coarse" tolerance displays a display alarm that can be deleted:
Alarm 22026 "Channel %1 Block %2 Following axis/spindle %3 Synchronism (2): Coarse
tolerance exceeded"
Alarm 22025 "Channel %1 Block %2 Following axis/spindle %3 Synchronism (2): Fine
tolerance exceeded"
This does not interrupt the machining.
Note
Both alarms can also occur simultaneously.
Exit
The second stage of the synchronous operation monitoring ends in the following cases:
● Deactivation of the coupling (for the power-down command: CPOF, CPDEL, CPLOF,
CPLDEL)
● New synchronization request by:
– CPON / CPLON / CPDO / CPLOF
– DB31, ... DBX31.4 (synchronize following spindle) = 1
– Internal synchronization requests
If, in these cases, the start conditions are satisfied again, the monitoring will be restarted.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
M3: Coupled axes
14.5 Generic coupling
533