User`s manual

Using the Electronic CAM Feature
GFK-1742A Chapter 16 Using the Electronic CAM Feature 16-5
16
Section 2: Cam Syntax
This section covers some critical features of the CAM feature and introduces the CAM Motion
Program statements and error codes.
CAM Types
An important concept concerning the CAM function is the different CAM types available. The
CAM profiles can be one of the following types:
1)
Non-Cyclic CAM
2)
Linear Cyclic CAM
3)
Circular Cyclic CAM
The following sections describe each of these CAM types.
Non-Cyclic CAM
A Non-Cyclic CAM has a unique non-repeating profile for the whole range of Master position
values. The CAM exits when either boundary of the CAM profile is reached. The CAM can also
exit if an external event is configured to trigger a conditional Jump. The User Units to Counts ratio
specified for the Master and Slave axes when configuring a Non-Cyclical CAM must match the
User Units : Counts ratio specified for the corresponding axes in Hardware Configuration. Also,
the maximum and minimum position values for the slave and master axes must lie within the
High/Low position limits specified for the corresponding axes in Hardware Configuration.
Linear Cyclic CAM
A Linear Cyclic CAM has a profile that keeps repeating until an event causes it to exit.
Furthermore, the numerical and physical end points of the CAM slave axis are the same as the
starting point of the cycle. A reciprocating crankshaft is an example of a Linear Cyclic CAM. The
User Units to Counts ratio specified for the master and slave axes when configuring a CAM profile
must match the User Units per Counts value for the corresponding axes in Hardware Configuration.
Figures 16-1 and 16-2 show an example of a Linear Cyclic CAM application.
Constraint
: The first and last slave point must be the same for a Linear Cyclic CAM. The CAM
Editor will not display the option for “Linear Cyclic” in the “Cam Type” field unless this constraint
is satisfied by the data in the CAM table.