Electro Cam 5000 Series - Manual (Page 54)

Mode Introduction - Mode 0 Operation
Appendix A-3
Introduction to Modes
The use of modes allows PS-5XX4 controls to perform
output logic which goes beyond simple cam outputs. There
are five different modes (modes 0-4) which can be assigned
to output groups. Each mode has unique operating
characteristic which can be matched to the logic
requirements of the corresponding groups. In many
situations, using mode logic can eliminate the need for
external logic (PLC or discrete circuits) in series with the
PS-5XX4 outputs.
Each output group can be operated in the most appropriate
mode, regardless of which mode(s) other groups are
operating in. In many applications, more than one mode
will be used to satisfy the control requirements of different
machine sections. Following are brief descriptions of the
modes:
Mode 0 - Outputs always enabled, like a simple cam switch,
and the group position can only be adjusted manually
through the keyboard. This mode is appropriate for output
signals which must occur at the exact same position in every
machine cycle.
Mode 1 - Resets group position to zero when the group
enable input signal occurs. Outputs are always active. This
mode is appropriate for phasing output groups from sensors
or other devices which signal a mechanical reference
position. Can also be used in applications where some
machine sections run multiple cycles per resolver
revolution.
Mode 2 - Disables group outputs until the group enable
input signal occurs. When the input occurs, the group
position immediately resets to the preset value and the
outputs are allowed to cycle during the next machine cycle.
This mode is useful for applications where products may
not be evenly spaced and the group outputs must only cycle
when a product has been sensed.
Mode 3 - Only enables outputs to cycle when group enable
input is on. If the input is off, all of the outputs in the
corresponding group will be off, regardless of position. Use
this mode where the presence of a maintained signal
indicates that it is OK for the group outputs to be active.
Mode 4 - Enables outputs to cycle if the group enable input
signal turned on during a designated portion (window) of
the cycle. Outputs will be disabled at the end of the cycle
until the input signal turns on again during the window
portion of another cycle. Use this mode to check presence
and correct position of a product before enabling the output
group for this machine cycle.
Example Applications that Use Modes
Web Converting Machines - Disposable diapers, medical
pads, office folders, etc. Phase relationships between
machine sections can be adjusted manually using Mode 0
or automatically using Mode 1.
Cartoners / Case Packers - Vacuum, material handling,
loading, and other functions are usually controlled in Mode
0. Gluing functions are typically controlled in Mode 4 to
prevent glue from being dispensed when containers are
not present.
Vertical Form/Fill/Seal Machines - Package material
handling output functions are controlled in Mode 0, while
pump or fill functions are handled in Mode 1 to automatically
correct for mechanical phase changes made between these
two sections of the machine (this allows one resolver to do
a job that would otherwise require two resolvers).
Machines with Multiple Cycle Ratios - Some machines
have different sections that run at different cycle ratios per
overall machine cycle. For example, one portion of a
machine may complete several cycles while another section
makes only one cycle. By using Mode 1 or 2, it is possible
to have some output groups cycling multiple times while
other groups cycle only once.
Details of Mode 0 - Standard Cam Operation
An output group operating in Mode 0 will turn on the outputs
every time the group position is within the programmed
position setpoints. The outputs are always enabled. No input
logic is used with Mode 0; the corresponding input is
ignored. The position of the output group can only be
adjusted through the keyboard using FCN 2. The group
position information will be stored in permanent memory
and proper group position will be restored each time the
control is powered on.
Use Mode 0 whenever the corresponding outputs are
required to operate during every cycle of the machine.
How to Program Mode 0 Operation
1. Program FCN 8 and 9 to correctly establish the
output grouping and modes required for this machine
application (insure that Mode 0 is selected for this
group).
2. Check that this group has the desired position
relationship to the machine position. Program FCN 2
to adjust it.
3. Program output setpoints to cycle the outputs on and
off at the desired output group positions.
No other programming is required for Mode 0.
Note: Mode 0 logic never disables the outputs, however,
Motion ANDing (FCN 7) can disable outputs that are
operating in Mode 0.