User Manual
Chapter 15
GFK-1742F
Jan 2020
Using the Electronic CAM Feature
333
15.3.4
CAM Command
The CAM command is used to program a CAM move using the specified CAM profile.
Syntax:
CAM
<”CAM Profile Name”>, <distance>, <master mode>, [Cyclic Exi
t Condition]
Parameter
Description
<”CAM Profile Name”>
Name of the CAM Profile from the CAM Library (the profile must be
linked to the CAM Download block). This name is limited to 20
characters maximum (also, see Note 3 below). Note that the quotes
around the name are required.
<distance>
Maximum distance the master axis can travel once the CAM is active
(in user units)
Distance can be a constant , a parameter or the keyword NONE.
Allowed Range:
–MaxPosn …. (MaxPosn
-1) uu/cts
<master mode>
Master mode can be declared as ABS (absolute) or INCR (incremental);
this indicates how the master position data is interpreted.
In ABS mode, an absolute master axis position is used to determine a
slave value from the CAM table. In INCR mode, the master value at the
starting point of a CAM command is assumed to be equal to the
“CAM
-
phase” value, and the slave values calculated during CAM
motion are relative to this start master value.
[Cyclic Exit Condition]
Specifies an exit condition for Cyclical CAMs. The allowed range is
CTL01-CTL32. If the CTL bit evaluates to True, the Cam exits at the end
of the current cycle. Note that this parameter must not be used for a
Non-Cyclic CAM profile.
Note:
1.
The CAM instruction is not permitted in a Multi-Axis motion program.
2.
A CAM command counts as two instructions towards the 1000 instruction limit in a motion
program.
3.
The Profile Names UDT_CAM_1, UDT_CAM_2, UDT_CAM_3 and UDT_CAM_4 are reserved for
future usage.
The <distance> argument in the CAM command is used to define the maximum distance
the master can travel through the profile before exiting. For Cyclic CAMs, the distance can
be either greater than or less than the length of the CAM table (defined as the absolute
difference between the first and last master positions in the CAM table). If the distance is
less than the length of the table, the CAM command exits once the distance has been
traversed. If the distance is greater than the length of the table, the CAM will cycle through
the CAM table until the distance is reached. Thus, the user may set up the number of times
a Cyclic CAM should be executed. For example, a distance of 2.5 times the length of the CAM
Table Master Position will cause the CAM profile to execute two and one-half times and then
exit. For non-Cyclic CAMs, the specified distance cannot exceed the length of the table.
The distance can also be specified as “NONE”. For a Cyclical CAM,
this will result in
continuous CAM motion until a CTL bit triggers an exit or motion is aborted. For a non-