REVISTA ROMÂNĂ DE AUTOMATICĂ - IPA SA

REVISTA ROMÂNĂ DE AUTOMATICĂ
5
Optimum wet mixing time (37s) was
established at 96% coated particles by similar
procedure with AASHTO T 195 [1].
3. Experimental research regarding the
general automation and information
integrated system of the pilot central
The general integrated automation and
information of the pilot central CEMA 15 has
a modular structure being distributed on two
machines and including 2 levels:
- level one , consisting of field equipment that
command technological installations and
appliances that provide information about the
technological equipment;
- level two, consisting of the PLC, the
cabinets and the computer in which are stored
recipes for asphalt mixtures, screens to
control the technological process and display
data of the process
There were tested the hardware and software
conditions necessary to achieve experiments
with the whole system:
- the PLC installed in the control room and
the cabinet on the machine 1;
- the computer installed in the control room
of the machine 2;
- the PLC drawer on machine 2 connected
through PROFIBUS-DP to the PLC drawer
on machine 1;
- the central unit of the PLC connected to the
PC via ETHERNET;
- connecting all the elements related to the
pre-batch equipment to digital inputs
modules, analogue and digital outputs of the
PLC on machine1.
- the program realized in STEP7
programming language downloaded to the
memory of the PLC;
- WIN CC FLEXIBLE 2005 RUNTIME
installed on the PC in the control room of the
station;
- the software made in WIN CC FLEXIBLE
2005 programming language installed on the
PC in the control room of the station.
4. Conclusions
The validated solutions obtained by the
experimental results on the pilot station
CEMA 15 will by applied at bigger scale in
the structure of asphalt mixing plants, of
larger productivities.
Acknowledgements
Authors acknowledges with thanks the
cooperation of S.c. NESAND Tulcea, mr.
eng. Virgil Barabangiuc.
References
[1] Asphalt Institute “The asphalt handbook”,
Manual series no.4 (MS-4), no. 3, 1989
edition, Chapter 5 – Manufacture of
Hot-Mix Asphalt, pp. 175-231.
[2] *** SR 174-1/2002 – Lucrari de drumuri.
Imbracaminti bituminoase cilindrate
executate la cald. Conditii tehnice de calitate.
[3] *** SR 7970:2001 – Lucrari de drumuri.
Straturi de baza din mixturi cilindrate
executate la cald. Conditii tehnice de calitate
si prescriptii generale de executie.
[4] Siemens - WinCC V6.0 Basic
Documentation, Edition: 04/03.
[5] Siemens - WinCC User Archives,
Edition: 11/98.
AR4-1.doc