VTK-VS-BA-015e-A | User Manual MDS 3200+ Series
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Operation
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6
OPERATION
6.1
Triggering a Dispense Sequence
There are three different options to trigger a dispense sequence:
•
by keypad on the MDC 3200
+
controller
press the
[trig]
button, a dispensing sequence with pre-set parameters will be trig-
gered
•
by RS-232C
use the command “VALVE:OPEN“
(further commands in chapter 7.1.2)
•
by PLC command
real time triggering by direct I/O
6.2
Dispensing and Positioning of a Multitude of Dots
(Modes)
To combine a multitude of dots to a predefined structure
(e. g. a line or a circle)
, use one of
the following modes:
•
Burst Mode
A single trigger impulse by PLC signal causes a predefined number of dispense cycles.
- Number of Pulses: predefined value
(e.g. 1–32.000)
•
Single-Shot Mode
Each dispense point is triggered by an individual PLC signal. When dispensing a continuous
feature
(such as a straight line or a circle),
the frequency of the dispense trigger signal
should be proportional to the trajectory speed of the axis system. This is necessary to
achieve a continuous line width.
- Number of Pulses: “1”
•
Infinite Mode
Continuous dispensing as long as the PLC trigger input is “logic 1”. Dispensing will
stop when the signal is changed to “logic 0”
- Number of Pulses: “infinite”
(when programmed through keypad)
“0”
(when programmed through RS-232C)
•
Scenario Mode
A complex set of shots is defined via a scenario. This allows the dispensing even of
very complex structures, since up to ten different setups, each with their own set
of parameters, can be combined. Four different scenarios can be saved.
The parameters are set according to the specifications of the scenarios.
•
External Mode
The “External Mode” will shift the responsibility of time control of the parameter
“Open Time” to the higher level machine control.
(This may require a very precise
time control of the higher level PLC.)
As a result, the valve would function like a
“Time-Pressure-Valve”.
- Number of Pulses: should be set to “1”
- Open Time: “external”
When the trigger signal is set to “logic 1”, the valve will open. It will remain open
as long as the trigger signal remains on “logic 1”. It will start to close when the
trigger signal is switched to “logic 0”. Parameters like Rising, Falling and Needle
Lift will be executed as saved in the MDC memory
(preset values).
After the valve has completely closed the controller is ready to receive the next
trigger signal to start the process again.
INFORMATION! (Open time and needle lift)
The maximum value for the “Open Time” is limited to 15 ms, if the “Needle Lift” is set
to more than 80 %. If not, the limit is 3000 ms. The length of the “Open Time” de-
pends on the PLC-signal
(logic 1)
.