Electro Cam 5000 Series - Manual (Page 57)

Mode 2 Operation
Appendix A-6
Details of Mode 2 -
Alter Position and Enable Outputs
An output group operating in Mode 2 only has its outputs
enabled after an input signal has occurred. The start
(leading edge) of an input signal instantly causes the group’s
position to be reset to zero. The outputs will immediately
be enabled to cycle, and will stay enabled until the next
input window is reached.
The input signal acts in a momentary manner. Therefore it
doesn’t matter how long the input remains energized. The
reset operation will occur when the leading edge of the
input signal occurs. However, once the reset occurs, the
control disarms the input and ignores it until it becomes re-
armed. A programmed window determines where the input
will become re-armed (re-arming the input is similar to
cocking a gun - once it is re-armed it can fire at any position).
The outputs are disabled when the next input window is
reached.
The input window is programmed in the same manner as
output pulses and is referenced to the corresponding group
position. Channel 91 is the window for Group 1, Channel
92 for Group 2, and so on up to Channel 98. The position
of the window determines where the outputs become
disabled and where the control starts looking for the next
input signal so the process can repeat. Note: If no window
is programmed, output will become active if input is
activated and will remain active.
The position reference that is established by input signals
does not get stored in the control’s permanent memory.
However, it is not important in Mode 2 since the outputs
will be disabled until an input signal occurs. On power up,
the input is armed, the outputs are disabled and the first
input signal received will cause the position to immediately
reset to zero.
PGM CHN
FCN
ON PULSE OFF
VIEW VIEW 1 2 3
4 5 6
7 8 9
0 DEC
CLR
CLE
ENT INC
ON/OFF SETPT
POS RPM
MOTION
POWER
CPU
5000 Series Prog rammab le Lim it Switch
0)
1)
2)
3)
4)
5)
Offset
Motion
Detection
Active
Program
Speed
Compensation
DEG/1000 RPM
Timed
Outputs
Program
Enable Code
Group 1 Output Group 2 Output
Additional output groups can be
controlling other machine functions
in different “modes” as needed
Group 1 Enable Input (resets
Group 1 position and activates
Group 1 outputs)
Conveyor Group 2 Enable Input (resets
Group 2 position and
activates Group 2 outputs)
Glue Heads
Sensor
Glue Bead
Sensor
One resolver provides travel
information for both glue heads
Example Application: Control different
machine functions asynchronously, on
demand
This illustration shows a PL
µ
S control and one
resolver “independently” controlling two glue
heads at different locations on a conveyor. The
spacing between parts being glued is random.
Each output group instantly resets its control
position when its enable input energizes. The
outputs in the group then become active for up
to 359 degrees.
Random spacing between parts is automatically
handled because each sensor causes the
position of its output group to reset. This
references the output signals to the leading
edge of the part being glued. When parts are
not present the outputs will be inactive.
Mode 2 Example Application
How to Program Mode 2 Operation
1. Program FCN 8 and FCN 9 to correctly establish the
output grouping and modes required for this machine
application (insure that Mode 2 is selected for this group).
2. Program the input window (CHN 9X) to start at 355 and
end at 359 as initial values.
3. Manually crank or jog the machine through a cycle with
a product present. After the reset occurs (sensor detects
start of product), record the group position values where
each of the group outputs needs to cycle on or off.
Program these values into the corresponding outputs.
4. Program the input window (CHN 9X) to start before the
next valid input signal leading edge will occur. The start
of the input window must be after the latest output off
position recorded in step 4 (the start of the window
disables the outputs) and before the next input signal
leading edge. Set the end of the input window to a
position that is ahead of the earliest position where group
outputs start cycling on.
Note: The group input window (CHN 9X) and the group
output position setpoints must be programmed individually
for each of the controller programs used. Different programs
can have different values as required.
If the output group fails to operate when the machine is run
with product present, insure that the group input leading
edge occurs after the first programmed window (CHN 9X)
and that the input is wired to the control correctly.
The flow chart to the right details how Mode 2 operates.