·584·
Installation manual
CNC 8055
CNC 8055i
14.
AXES CONTROLLED FROM THE PLC
SOFT: V02.2X
PLC execution channel
When using parametric programming, it is recommended to previously assign a value to the
corresponding global parameter by means of the instruction: CNCWR.
To govern axes managed by PLC, use the following marks associated with "Feed-hold" and "Transfer
Inhibit":
Feedrate of the axes
The programming format for the axis feedrate (F5.5) depends on the function (G94 or G95) and on
the work units selected for this execution channel.
• If G94, in mm/min. or inches/min.
• If G95, in mm/rev or inches/rev.
It must be borne in mind that this feedrate depends on the actual spindle rpm which is in the main
execution channel.
If the moving axis is rotary, the CNC interprets that the programmed feedrate is in degrees/minute.
Modify the feedrate (override)
The PLCCFR variable sets, from the PLC, the % of feedrate selected by the execution channel of
the PLC.
General parameter MAXFOVR (P18) limits the value of the percentage applied to both execution
channels (main and PLC).
The OVRCAN (M5020) mark sets the feedrate override of the main channel to 100%. It does not
affect the feedrate override of the PLC channel
Same as with the main channel, the following movements have a special treatment:
• When searching home, the value of PLCCFR is ignored.
• In G0, it considers the value of general parameter RAPIDOVR (P17)
If "P17=NO" always 100%, except if PLCCFR=0. In that case, the movement stops.
If "P17=YES" considers PLCCFR, but it limits its value to 100%.
• In G1, G2, G3 it is always applied except when operating at maximum feedrate (F0), it is limited
to 100%.
• In G75, G76, it is only applied when the axis parameter FOVRG75 (P126) = YES.
... = MOV 150 R1
Assigns the value of 150 to register R1.
... = CNCWR (R1, GUP200, M100)
Assigns the value of R1 to parameter P200, (P200=150).
... = CNCEX (G90 G1 U P200, M100)
Requests the CNC to execute the command: G90 G1 U150. The U axis will go to position 150.
/FEEDHOP (M5004) Similar to the /FEEDHOL signal
FHOUTP (M5504) Similar to the /FHOUT signal
/XFERINP (M5005) Similar to the /XFERINH signal
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