2 plans backgrounds
At present our country petroleum chemical industry profession in work aspect the and so on management system management system, safe supervisory system, oil discharge system, fire prevention system automaticity all quite is low. But along with the our country petroleum chemical industry market further opening, compares with the overseas advanced automatic equipment and the management mechanism. The domestic fuel depot automaticity enhancement is imminent, in the Chinese petrochemistry main corporation to standardized fuel depot promoting with the initiative under, we fully considered the fuel depot the profession characteristic as well as the present domestic fuel depot condition, in is near on the Hong fuel depot safe supervisory system to use the PROFIBUS main line to the scene equipment real-time surveillance, the common control. The Jiangsu Province Lienyungang city near the Hong fuel depot automation transformation, is the experiment site project which China petrifies, the demonstration project, under specifically chats in it on the supervisory system concrete application.
3 system designs plan
The fuel depot supervisory system is a standardized fuel depot automation important aspect, the overall system divides 4 levels:
(1) the tube controls the central level
Stands, the operator including engineer stands, the measurement station, the server, sends the service station, mutually between through industry ethernet connection. Stands the monitoring data in engineer which, the operator stands through Simens WINCC to realize, isolates through the switchboard with exterior network, the data security is reliable;
(2) master station level
The master station level completely uses Simens the PLC module, CPU is 315 - 2DP, passes the CP343 module and the network communication;
(3) storehouse district branch net level
The storehouse district branch net level uses the field bus is the PROFIBUS main line, because storehouse district scope big, the route is far, the transmission medium elects is 4 cores optical fibers, the redundancy connection. The scene all substations data turns on the master station through the PROFIBUS main line. According to the present equipment position, as well as the next video frequency, the pipeline wall pressure transmitter, the motorized valve and so on the increase, we altogether will construct four substations, two already put into the use, two spare;
(4) execution, sensor level
All scenes execution, the sensor turn on the substation through the AS-I main line. We construct according to the scene equipment distribution characteristic have two AS-I main line, in the suitable place considered reserves. Equipment turning on is extremely convenient with the disassemblage.
System network chart like chart 1 shows.

3.1 substations structures
(1) substation 1 structure drawing like chart 2 shows
In chart 2 turns on spot:
A) 15 groups fires alarm 5DI
B) 5 groups combustible gases alarm 2AI

C) the hand operated valve arrives returns to the signal (reply) certain
(2) substation 2
Substation 2 structure drawings like charts 3 show.

In chart 3 turns on spot:
A) 9 groups 485 pots preprocessor signal 485 main lines
B) 4 groups fires alarm 4DI
C) 7 groups combustible gases alarm 2AI
D) the hand operated valve arrives returns to the signal (reply) certain
3.2 monitorings pictures
Monitoring picture like chart 4 shows.

4 systems characteristics
(1) the system opens, the internationalization
The PROFIBUS main line at present applies in the world extremely widely, it is does not rely on the equipment producer's field bus standard. Widely is suitable for the manufacturing industry automation. flow industrial automation and the building. transportation electric power and so on other domain automations. Also the data transmission performance safe is reliable.

(2) the low cost superiority is obvious
AS-i is the direct connection scene sensor, the execution main line system, the AS-i main line enable to approach the scene the simple module (sensor, execution and operator terminal and so on) can connect the lowest level control system, this is the automated technology one kind is simplest, the cost lowest solution, the practice card ming dynasty printed books system at least needs 3 engineers according to the conventional wiring a week to be able to complete, after uses the AS-I line, only needs 2 engineers 5 days to complete, obviously saves the implementation cost, reduced the time limit for a project.
(3) the system expands easily to melt
Because on the PROFIBUS main line may hang from the station may reach 125, when preliminary overall wiring reserves the substation position in the suitable place. When the big system turns on, activates the substation then. When a scene measuring appliance increases, only must enter the measuring appliance wiring company the nearby AS-I line. Also joins the system or the equipment and the original system mutually do not affect.
(4) services the convenience
Because on PROFIBUS main line substation distinction independent, when some substation dying machine, even is paralysed, the power cut has not affected to other substation, the AS-I main line equipment may the live-wire work, namely insert namely uses, in does not affect the movement in the situation, the overhaul is extremely convenient.

5 concluding remark
This supervisory system fully using Simens the PLC product reliability, as well as field bus openness, and considers the fuel depot measuring appliance the dispersivity and the security, therefore simultaneously has used two kind of main lines: Since PROFIBUS, the AS-I main line, has moved a nearly for year, the performance stably to at present, safe, is reliable, obtained user's high praise.