Siemens PLC Programming Help

[yogi.g2982]

Hi all Expert,

I need help to develop PLC code. I have 11 no. of process tank in each tank thier is some process operation e.g Heater on/off,Temp.setpoint and Drain Valve on/off.For this process I want to use 5 no. of receipe in that receipe 3 no. of parameters setting is requied plz see below example for receipe-1.

for example Receipe-1 parameter Setting..


Tank Temp. Heater On/off Drain Valve On/off
Set point Selection Selection

Tank-1 50 0n off
Tank-2 60 on off
Tank-3 56 on on
Tank-4 67 on on
Tank-5 98 off off
Tank-6 102 off off
Tank-7 23 on on
Tank-8 14 on on
Tank-9 35 off off
Tank-10 67 off off
Tank-11 88 on on
Tank-12 56 on on


for remaining 2,3,4 and 5 receipes thier will be diferent setting like Temp set point,Heater on/off Selection and darin on/off selection it is totaly depend on process requirment.


Please help to How to write above PLC code.

Waiting for your positive reply.


Regards,

Yogendra G.

 

[moggie]

Hi all Expert,

I need help to develop PLC code. I have 11 no. of process tank in each tank thier is some process operation e.g Heater on/off,Temp.setpoint and Drain Valve on/off.For this process I want to use 5 no. of receipe in that receipe 3 no. of parameters setting is requied

Waiting for your positive reply.


Regards,

Yogendra G.

To start with -

Which Siemens PLC? Which HMI?
First list all the parameters that you will need for one tank, include any tolerance (+/-) parameters.
Decide if these parameters are to be duplicated across all tanks - or do certain tanks require different parameters?.
Then look at the recipe function within the HMI.

Decide which memory area of the PLC, the HMI recipe function will store the recipe information - DB etc

 

[L D[AR2P#0.0]]

Example SCL implementation:

TYPE UDT1
    STRUCT
    TemperatureSetPoint:REAL;
    Heater:BOOL;
    DrainValve:BOOL;
    END_STRUCT
END_TYPE
TYPE UDT2
    STRUCT
    Tank:ARRAY[1..11] OF udt1;
    END_STRUCT
END_TYPE
TYPE udt3
     STRUCT
     Recipe:ARRAY[1..5] OF udt2;
     END_STRUCT
end_type

DATA_BLOCK DB1
    STRUCT
    Process:udt3;
    END_STRUCT
BEGIN
Process.Recipe[1].Tank[1].TemperatureSetPoint:=11.0;
Process.Recipe[1].Tank[1].Heater:=True;
Process.Recipe[1].Tank[1].DrainValve:=False;
Process.Recipe[1].Tank[2].TemperatureSetPoint:=12.0;
Process.Recipe[1].Tank[2].Heater:=True;
Process.Recipe[1].Tank[2].DrainValve:=True;
Process.Recipe[1].Tank[3].TemperatureSetPoint:=13.0;
Process.Recipe[1].Tank[3].Heater:=False;
Process.Recipe[1].Tank[3].DrainValve:=False;

Process.Recipe[2].Tank[1].TemperatureSetPoint:=21.0;
Process.Recipe[2].Tank[1].Heater:=True;
Process.Recipe[2].Tank[1].DrainValve:=true;
Process.Recipe[2].Tank[2].TemperatureSetPoint:=22.0;
Process.Recipe[2].Tank[2].Heater:=False;
Process.Recipe[2].Tank[2].DrainValve:=True;
Process.Recipe[2].Tank[3].TemperatureSetPoint:=23.0;
Process.Recipe[2].Tank[3].Heater:=False;
Process.Recipe[2].Tank[3].DrainValve:=True;
 
END_DATA_BLOCK

FUNCTION_Block FB1
VAR_INPUT
    Recipe:udt2;
    Tank:INT;
END_VAR
VAR_OUTPUT
TemperatureSetPointQ:int;
HeaterQ:BOOL;
DrainValveQ:BOOL;
END_VAR
TemperaturesetpointQ:=REAL_TO_INT(Recipe.Tank[Tank].TemperatureSetPoint);
HeaterQ:=Recipe.Tank[Tank].Heater;
DrainValveQ:=Recipe.Tank[Tank].DrainValve;
END_FUNCTION_BLOCK
FUNCTION_BLOCK FB2
VAR_INPUT
    Process:udt3;
    Recipe:INT;
END_VAR
VAR
fbTank1:fb1;
fbTank2:fb1;
fbTank3:fb1;
fbTank4:fb1;
fbTank5:fb1;
fbTank6:fb1;
fbTank7:fb1;
fbTank8:fb1;
fbTank9:fb1;
fbTank10:fb1;
fbTank11:fb1;
END_VAR
fbTank1(Recipe:=Process.recipe[Recipe],Tank:=1);
fbTank2(Recipe:=Process.recipe[Recipe],Tank:=2);
fbTank3(Recipe:=Process.recipe[Recipe],Tank:=3);
fbTank4(Recipe:=Process.recipe[Recipe],Tank:=4);
fbTank5(Recipe:=Process.recipe[Recipe],Tank:=5);
fbTank6(Recipe:=Process.recipe[Recipe],Tank:=6);
fbTank7(Recipe:=Process.recipe[Recipe],Tank:=7);
fbTank8(Recipe:=Process.recipe[Recipe],Tank:=8);
fbTank9(Recipe:=Process.recipe[Recipe],Tank:=9);
fbTank10(Recipe:=Process.recipe[Recipe],Tank:=10);
fbTank11(Recipe:=Process.recipe[Recipe],Tank:=11);
MW256:=INT_TO_WORD(fbTank1.TemperatureSetpointQ); 
Q0.0:=fbTank1.HeaterQ;
Q0.1:=fbTank1.DrainValveQ;
MW258:=INT_TO_WORD(fbTank2.TemperatureSetpointQ); 
Q1.0:=fbTank2.HeaterQ;
Q1.1:=fbTank2.DrainValveQ;
MW260:=INT_TO_WORD(fbTank3.TemperatureSetpointQ); 
Q2.0:=fbTank3.HeaterQ;
Q2.1:=fbTank3.DrainValveQ;
//..continue allocation fo i/o here
END_FUNCTION_BLOCK
DATA_BLOCK DB2  FB2
BEGIN
END_DATA_BLOCK

ORGANIZATION_BLOCK OB1
VAR_TEMP
    // Reserved
    info : ARRAY[0..19] OF BYTE;
    // Temporary Variables
END_VAR
FB2.DB2(Process:=DB1.Process, Recipe:=1); 
END_ORGANIZATION_BLOCK