Vermes MDS 3000 Series, User Manual

Page: 52 / 77

VTK ‐ VS ‐ BA ‐ 004e ‐ B | User Manual MDS 3200A
| Communication Interfaces
52
7.2.2 Remote Adjust
7.2.2.1 Purpose
During a remote adjust, as opposed to the normal procedure (see page 31) , the system is
operated from a master device (e.g. a PC) , by means of interfaces (PLC, RS ‐ 232C). The func ‐
tion itself is identical.
7.2.2.2 Advantages
The remote adjust allows for total control of an MDC 3200A 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 meanwhile 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 “Unscrew nozzle press enter“.
Step 2: The nozzle unit must completely be detached, so that the tappet becomes visible.
Step 3: In order to confirm step 2, a short trigger signal (500 μ s – 80 ms) must be sent to
the control unit – via PLC ‐ interface. The system then returns the current “Adjust
Value”, continuously repeating the transmission to the PC in intervals of 500 ms
(via RS ‐ 232C) .
Short Trigger signal:

5 V or 24 V (PIN2 + PIN4 or PIN3 + PIN4 Input signal of MDC via 15 pin Sub ‐ D)

Signal length: 500 μ s – 80 ms
An additional command to update the adjust value on the screen is therefore not
required.
Step 4: Rotate the nozzle unit clockwise towards the fluid box, until the value displayed
on PC is in the tolerance range (between 1020 and 1039) . If desired, you can also
watch the green LED on the control unit.
Step 5: Confirm the indicated value (e.g. 1035) by sending a short trigger signal via PLC ‐
interface, as described above. The system returns the following response via RS ‐
232C:
1. “Adjust LED Green“ = The adjust has successfully been completed and the
green LED is lit. Beyond the tolerance range (1020 ‐ 1039) it is impossible to con ‐
firm the values.
In these inadmissible ranges, the adjust can only be interrupted by sending a long
trigger signal (100 ms – 200 ms) to the control unit via PLC ‐ interface. The system
returns the message “Adjust failed“ to the PC.
Long Trigger signal:

5 V or 24 V (PIN2 + PIN4 or PIN3 + PIN4 Input signal of MDC via 15 pin Sub ‐ D)

Signal length: 100 ms – 200 ms