·576·
Installation manual
CNC 8055
CNC 8055i
13.
ACCESS TO INTERNAL CNC VARIABLES
SOFT: V02.2X
Other variables
RCVCTRL
Variable used to control reception. It has 7 bits that are counted from right (LSB) to left (MSB). This
variable may be read and written from the CNC, from the PLC and from DNC.
The following table shows the meaning of each bit:
PLCAS
This variable may read and written from the PLC and it may be used to change the value of the
auxiliary spindle speed. The sign indicates the turning direction.
DISABMOD
This variable is used to disable some actions or modes by setting the corresponding bit value to
1. This variable may be written from the PLC and read from the PLC, DNC and CNC.
The following table shows the meaning of each bit:
CYCCHORDERR
This variable defines the chordal error of the canned cycles. It may be read and written from the
part-program.
The CYCCHORDERR variable lets modify the chordal error of the cycles so the user can increase
or decrease it for the parts as needed.
Using this variable is necessary, for example, on parts with curved areas using the 3D pocket cycle.
On these parts, if the radius is very large, the segments are noticeable. The parts get better by
decreasing the chordal error.
Using this variable, the user can decrease the chordal error on the part as needed. Decreasing the
chordal error can increase machining time.
Once the value of this variable has been changed, it remains active until the CNC is turned off.
Default value of the CYCCHORDERR variable (250 tenths of a micron).
Programming example:
It is recommended to use a CYCCHORDERR value of 25 tenths of a micron. This value improves
part finish and it does not increase machining time too much.
Bit Meaning
0, 1 Not used.
2 (Value 0) End reception if RCVENDTI (P12) is exceeded.
(Value 1) Ignore the timer.
This bit checks this bit every time the = READ instruction is executed.
3 ... 6 Not used.
7 (Valor 0) Message reception enabled.
(Valor 1) Message reception disabled.
It is tested at the beginning of the PLC cycle.
Bit Meaning
0 If 1, the PLC program cannot be displayed. The PLC in ladder (contacts) diagram cannot
be displayed either.
1 If 1, the date cannot be changed, although it displays the access softkey. It is valid for
the explorer and for "UTILITIES".
2 If 1, the passwords cannot be changed. The passwords cannot be seen or changed
although it displays the access softkey. It is valid for the explorer and for "UTILITIES".
(CYCCHORDERR = 25)
(PCALL 9986, P200=0)
M30
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