July 2013 6.7 Reference marks 799
External reference
pulse
If the reference mark of the encoder cannot be used, e.g. owing to an
unfavorable transmission of motor and rotary axis, an external reference pulse
may be evaluated.
In MP4130.x, define the fast PLC input for the external reference pulse
For the corresponding axis in MP1360.x, enter the number of the fast PLC
input
Enter MP1350.x = 6 for the corresponding axis
This can also be used for linear axes. Activation of the fast PLC inputs
(MP4130.x) makes it possible to interrogate the inputs in the controller cycle.
This controller cycle time and the traversing speed when crossing the
reference mark mainly determine the accuracy of the reference run:
Fast traverse speed --> less accurate
Longer controller cycle time --> less accurate
It may be possible to achieve sufficient accuracy with two reference runs (first
fast, then slow). Specify the logic for the fast PLC inputs with MP4131.2-5.
"Traverse
Reference Points"
operating mode
The NC uses W272 to report the "Pass Over Reference Point" operating mode
to the PLC.
If you switch the operating mode before all reference marks are traversed, the
PASS OVER REFERENCE soft key prompts you traverse the remaining reference
marks. In W1032/W1116 the PLC receives the information as to which axes
have not yet been referenced.
In W1032/W1116, the bits for axes that are not to traverse the reference
marks (MP1340.x = 0) remain set.
In the NCMACRO.SYS file, after the code number RESETINIT= you can enter
the name (incl. path) of a macro that will be called when the Pass Over
Reference Point mode of operation is exited. If the NC macro is terminated
once with END PGM or M02, it will no longer be run when the Pass Over
Reference Point mode is called and exited.
If M4622 is set during the first run of the PLC program, the message window
Waiting for M4622 appears after the reference marks have been traversed.
The window does not disappear until you have reset M4622. In this way, you
can delay the execution of the NC macro defined through RESETINIT = in the
NCMACRO.SYS.
To synchronize the current machine status and the look-ahead calculation with
an NC macro call, see "NCMACRO.SYS" on page 1709.
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