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VTK-VS-BA-015e-A | User Manual MDS 3200+ Series
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Communication Interfaces
7.2.2
Remote Adjust
7.2.2.1
What is the Remote Adjust?
A remote adjust is similar to a normal adjust
, but the system is operated from
a master device
(e.g. a PC)
by means of interfaces
(PLC, RS-232C).
The function itself is iden-
tical.
7.2.2.2
Advantages
The remote adjust allows for total control of an MDC 3200
+
integrated in a machine, since
dispensing parameters can be monitored by the software of this machine. The control unit
can be built in with permanent key lock. Thus the modification of parameters without au-
thorization can be prevented in the machine software.
7.2.2.3
Procedure
The remote adjust has to be performed according to the following instructions:
INFORMATION! (Displaying remote adjust)
•
In the course of the entire procedure, both adjust LEDs are lit simultaneously.
•
The display shows “Remote Adjust is running!”
•
For transmission of the orders between PC and control unit, both of the interfaces
(RS-232C as well as PLC-interface)
are used.
Step 1:
Send the command “ADJUST:START“ to the control unit via RS-232C. The system returns the
message “Open MNL Screw Press Enter“.
(For an A-valve, the first response is directly “Un-
screw Nozzle Press Enter”, since step 2 is omitted.)
Step 2:
Turn the MNL screw counter-clockwise until it is completely open. The positions “completely
open” and “completely closed” are marked by a slightly higher resistance.
Step 3:
In order to confirm step 2, a short trigger signal
(500μs
– 80 ms)
must be sent to the control
unit via PLC interface. In response the monitor of the PC shows “Unscrew Nozzle Press En-
ter“.
Short Trigger signal:
5 V or 24 V
(PIN2 + PIN4 or PIN3 + PIN4 Input signal of MDC via 15 pin Sub-D)
Signal lengt
h: 500 μs
– 80 ms
Step 4:
The nozzle unit must be completely detached, so that the
tappet becomes visible.