Fagor 8035-M, Installation Manual

Page: 403 / 470

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Installation manual
CNC 8035
AXES CONTROLLED FROM
THE PLC
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Modify the feedrate (override)
The PLCCFR variable sets, from the PLC, the % of feedrate selected by the execution channel of
the PLC.
G.m.p. 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 g.m.p. "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).
• In that case, it is limited to 100%. In G75, G76, it is only applied when g.m.p. FOVRG75 (P126)
= YES.
Blocks programmed in high-level language
The high-level instructions that can be used in the PLC execution channel are:
(IF condition <action1> ELSE <action2>)
(CALL (expression))
Programming high-level blocks has the following restrictions:
• The programmed blocks can only work with global parameters.
• Up to 5 nesting levels of standard subroutines are allowed (neither parametric nor global).
CNCEX ((CALL 100), M1000)
Sends the (CALL 100) command to the CNC so it executes (calls) subroutine 100
CNCEX ((P100=P100+2), M1000)
Sends the (P100=P100+2) command to the CNC to increment the value of parameter
P100 in 2 units.
Example in mm:
Move the W axis to the coordinate indicated by register R101.
When the PLC works with integers (32 bits), the value of register R2 is given in tenths of
microns (0.0001 mm).
CNCWR (R101, GUP 155, M101)
Assigns the value indicated in R101 to global parameter P155.
CNCEX ((P155=P155/10000), M101)
Converts the value of P155 into mm.
CNCEX (G1 WP155 F2000, M101)
Movement of the W axis.