Parker PDHX-E Series, User Manual

Page: 86 / 103

If a power-on sequence is used, the sequence and its sequence number are stored in the
non-volatile RAM.
Programming Sequences
Sequences are programmed by first sending a sequence definition command XD, which
places the commands following XD in the sequence buffer. This continues until an end of
sequence command (XT) is received. Any condition which prevents proper recording of the
sequence is saved and can be accessed with the status command XSD. The programmed
sequence can be tested with the run sequence command XR, which executes any specified
sequence.
Note: A sequence cannot be defined whilst there are buffered commands still waiting to be
executed i.e., while the drive is in an active state.
The XU command can be used to read back the entered sequence.
To begin the programming of a sequence, the XD command immediately followed by
sequence identifier number (1 to 64) and a delimiter must be entered. An XT command ends
the sequence. The save command SV should be used to store the sequence into the
positioner's non-volatile memory.
The commands entered after the XD command and before the XT command will be executed
in the order in which they were entered when the sequence is run.
Example:
NOTE: The ">" prompt is replaced by the "$" prompt when in sequence edit mode.
XD1 Begin definition of sequence No.1
A10 Set acceleration to 10 revs/sec/sec
V10 Set velocity to 10 revs/sec
D4000 Set move distance to 4000 steps
G Go
H Reverse next move
G Go
XT End of sequence
* The definition of sequence No.1 is terminated by XT but the sequence is NOT stored in
non-volatile memory until
the save command SV is given.
NOTE: Turn off switch 8 (on top of the drive) to write-protect sequences.
Whenever the above sequence is run, the motor will turn 1 revolution CW and then 1
revolution CCW.
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