VARIOUS COMPONENTS
FOR NETWORKING
Chromatographs, control units, server PCs and
control systems can be combined together in
numerous versions. The interconnections are de-
scribed in the register External piping and wiring
diagrams. Here we shall describe how the individ-
ual components interact.
Control units
IBM
-compatible personal computers (PCs) are used as
the control units. Laptops are suitable for local oper-
ation, we recommend powerful Desktops for stationary
operation.
Server
It is advantageous to use server PCs if several chroma-
tographs are to be networked. The server is connected
between the chromatographs and control unit and col-
lects all data from the chromatographs. It relieves the
load on the control unit, and permits redundant net-
works and control system links.
We recommend particularly powerful
IBM
-compatible
personal computers as the server.
Interface converters
Interface converters are required because PCs do not
have a
TTY
or
RS485
interface. The converters have
their own housing with 230/115-V connection.
TTY repeater
Each
TTY
repeater extends the range of
TTY
cables by
200 m. It replaces one chromatograph in the current loop!
The
TTY
repeater has its own housing with 230/115-V
connection or power supply respectively.
Modems
All functions of the ChromLAN are possible via
modems. Several chromatographs can also be net-
worked to a modem using a Schniko.
Dedicated line modem
Uses the fixed telephone cables within a company. This
means that repeaters are superfluous and that distances
can be covered up to more than 10 km.
Switched modem
Has an unlimited range via the telephone network. A
dialling procedure is required (waiting time).
Chromato
raphs
* PGC302
* P30/30
* PGC102
* RGC202
Couplin
modules for PCs
Modems
RS232/TTY
RS232/RS485
RS232/RS485
RS232/TTY
RS232
Telephone number
220V
PCs
VGA
386/33
Color
RS232
RS232
Some also as plug-in
boards for 19-inch
system and for PC
Interface converters
RS232
TTY
aktive
220V
* Control PC
* Server PC
* Switched modem
* Dedicated line modem
Telephone line
DF20
TTY
TTY
RS232
RS232 link
5V/12V
RS232
RS232
RS232
DF32
RS232 / RS485
RS232 / RS485
Control systems
* Teleperm M
* Simatic S5
* Honeywell TDC3000
RK512 with D3964
TTY or RS232
RS232
* Variograph/Piezograph
* Control systems
* More than 1 control PCfor
Modbus
TTY
RK512 with D3964
RS232
RS485
220V
TTY converter
RS485 converter
Networking
2VERNETZ.CHP, Stand Dezember 22, 1999
23
To Next Page
Loading...
