Danfoss MCO 305 Design Manual page 158

MCO 305 Design Guide
SYNCERR
Summary
Syntax
Return Value
Description
Command Group
Cross Index
Syntax Example
Samples
158
__ Software Reference __
Queries actual synchronization error of the slave
res = SYNCERR
res = actual synchronization error of the slave in UU and
a) as an absolute value when the value of the accuracy window is defined with
a plus sign in the parameter SYNCACCURACY;
b) with polarity sign when in SYNCACCURACY the value of the window is
defined with a minus sign.
SYNCERR returns the actual synchronization error in User Units UU. This is the
distance between the actual master position (converted with drive factor and
offset) and the actual position of the slave.
If the par. 33-13 SYNCACCURACY is defined by a minus sign, you can also
determine whether the synchronization is running ahead (negative result) or
running behind (positive result).
NB!:
Up to option card version < 5.00: SYNCERR only functions in synchronization
mode. As soon as you exit SYNCM or SYNCP, the pulses are no longer counted.
SYNCERR is only updated within a SYNC command.
With option card software 5.00 onwards the SYNCERR is also updated when SYNCP
or SYNCM are not longer active, e.g. after a MOTOR STOP.
I/O
TRACKERR, MAPOS, APOS,
Parameters: 33-12 Position Offset for Synchronization (SYNCPOSOFFS), 33-10 and
33-11 Synchronization Factor Master and Slave , 33-13 Accuracy Window for
Position Sync. (SYNCACCURACY)
PRINT SYNCERR /* query actual synchronization error of the slave */
SYNCACCURACY = 1000
Here the SYNCERR returns the
absolute value 700.
SYNCACCURACY = 1000
SYNCERR will display the absolute
value 700 eventhough the slave is
ahead of master.
Here the SYNCERR returns the value
of –700 showing that the slave is
ahead of master.
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