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Grain depot supervising system design scheme
----Beijing Sunwayland ForceControl Technology Co.Ltd.
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One, Systematic basic structure
This system consists of three bases unit, the cell is examineed in the field 、the system operation is halt and the control net to make up .
1. Instrumentation cell at field
The field is surveyd through the temperature to the barn of thermal resistor,every one barn possess around at 200 analogs to input （They all are thermal resistor signals ）；moreover on the basis of the cereals food situation carries on the moisture examination to the field.
2. The system operation is halt
That 1 operation halts is build up that to this system, take the human-machine interface action, manipulating stop operation industry ForceControl software, the temperature to the field is carried on data logging. In the way of siemens PLC`s control field conveyer ,Lifter ,Power-driven sluice gate.The air ventilator is switched on ruing,along with the warning and so on meritorous service capacity feedback signal, the realization automation is dominateeed .
3. The control net
The control net adopts MPI and RS485 one another to unite dominateeing.The control unit adopts siemens 314CPU in the interest of the master control station, figure spot at control and keeps watch on field.But the use is pestle , and temperature and the moisture that auspicious PCL-745`s plank checks to the field collects, dependability is high. All planks check work completely .Independence ”，Whatever one arise regular collect that therefore the block wholly be unlikely not affect else temperature spot a bit.
Two Systematic basic function
First, Food affection system
1. Systematic strong point
The mild moisture signal of this scheme wholly is the digit signal, the electric network wiring is convenient .Economy, for yet the person who outputs directly act as the networking digit signal to every one mild moisture probe ,the signal transfer process attenuation be unlikely not affect the systematic accuracy, and transmission range is elder, every one out of line rim , gleam of bus mild moisture the person who cranes one`s neck may be join away from attainability 200M .
Collecting the module discriminatees the sensor form voluntarily .Amount ,Layout as extension convenient,may be on the basis of the field installation term ,the proper selection module installation place reaches to employ module amount ,in order that cuing down the cost .
Adopt the low work loss to design, merely require to supply power to the utensil collecting ,not have to not supply power to the sensor ,the power supply spot at field is little ,building is convenient.
2. Systematic scheme
On the basis of the actual situation of field ,Adopt the LTM8600`s temperature moisture module to collect, usually barn ,the survey temperature is counted to be smaller than 500 spots ,employ LTM8003`s module be able to meet the demand essentially ,each module possess 8 quiz electric cable interfaces ,per electric cable may join 64 survey Wen Dian.
As a result of the reason of high and Lou Bu of warehouse, for the sake of field installation is convenient ,fathoming the mild electric cable oridinarily adopts that the trunk transmits out of line + fathoms the mild cable connection utensil + testing the electric cable means,the survey temperature shall being divided into appropriately length electric cable is fixed being living the appropriate place. Fathoming the mild electric cable repeater may prolong fathoming mild electric cable length ,lift the utilization ratio of LTM-800`s module and survey Wen Xianlan ,degradution cost .
3. Strenuously accuse the configuration software implementation meritorous service capacity
Achieving the real-time data collects the monitoring
The history of data is stored
Report writer
Warning
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