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Details of Mode 4 -
Input Signal Required for Output Cycle
An output group operating in Mode 4 only has its outputs
enabled after an input signal has occurred within a specified
window of the machine cycle. The start (leading edge) of
the input signal will cause the group's outputs to be enabled
to cycle, and they will stay enabled until the next input
window is reached. The group position is not altered by the
input signal.
The input signal acts in a momentary manner, therefore, it
doesn't matter how long the input remains energized.
However, the leading edge of the input must occur within
the programmed input window. The outputs will then
become enabled and will remain enabled until the start of
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 starting
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.
The position reference for the group is not affected by the
input signal. Therefore the group position maintains a
constant relationship with the machine position. On power
up, the group position will be based on the last position
reference that was determined by FCN 2 programming.
This reference can only be altered through FCN 2
programming from the keyboard.
Example Application: Operate
machine function(s) only if sensor
detects part in correct position
In this illustration the punch will operate if
the enable sensor detects the leading
edge of the part at the correct position in
the machine cycle. The presence and
correct position of parts is verified by the
enable sensor before the group output(s)
are activated. The control position
remains in sync with the machine position.
The output(s) in the group become active
for the remainder of the machine cycle if
the enable sensor signal occurs within a
specified position in the machine cycle.
Sensor signals that occur outside of the
programmed "enable input window" will
be ignored.
This mode of operation is appropriate for
flight bar conveyors, rotary index tables
and similar types of machinery.
Mode 4 Operation
How to Program Mode 4 Operation
1. Program FCN 8 and FCN 9 to correctly establish
the output grouping and modes required for this machine
application (insure that Mode 4 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. Record the starting position value where the sensor first
detects the product as it passes by (leading edge of
input).
4. Record the earliest and latest positions where one or
more outputs in this group must be on.
5. Program the input window (CHN 9X) to start before the
leading edge position of the input signal (recorded in
step 3) and end after the leading edge position. The
start of the input window must be after the latest output
position recorded in step 4 (the start of window disables
the outputs) and before the leading edge of the input
signal occurs. Set the end of the input window to the
latest position in the cycle that a valid input signal
leading edge could occur.
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 within the programmed window (CHN 9X) and
that the input is wired to the control correctly.
Note: Once programmed in a channel, this function
will be present in that channel in all programs.
Additional output groups can be
controlling other machine functions
in different "modes" as needed
Empty flight bar
will
automatically be
skipped
Part too far ahead of
flight bar will be
skipped
Conveyor
Resolver monitors conveyor travel
Appendix
A-10
Mode 4 Example Application
FCN
0)
Program
Enable Code
PGM
CHN
1)
Motion
Detection
2)
Offset
1
2
3
3)
Active
Program
4
5
6
4)
Speed
Compensation
DEG/1000 RPM
7
8
9
5)
Timed
Outputs
0
Hole Punch
Enable sensor
(activates group
outputs for 1 cycle)
M OT IO N
POWER
CPU
ON/OFF
SET PT
CLR
CLE
5000
Series
Programmable Limit Switch
ENT
Activated output fires punch
when programmed output
setpoints are reached
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