[?]: S7 300 PID Program Using LAD

[amruthkiran]

we have a TMT system for our steel plant.
TMT stands for thermomechanical treatment system. It is a water cooling system for cooling the steel rods. The steel rods will pass through the TMT in milliseconds. I have to control the outlet temperature of steel rods coming out of TMT using water cooling.

Inputs available:
1. Input temperature(4-20mA) of steel rod before TMT (Pyromter input)
2. outlet temperature(4-20mA) of steel rod before TMT (pyrometer input)
3. Flow rate (4-20mA) from magnetic flowmeter
4. Pressure sensor input

Analog Output

1. Flow rate control using 4-20mA input to flow meter


I have to program TMT in such way that outlet of TMT should be maintanied at 250 degree C by controlling the flow.

Please provide some tips to program the TMT.

Can I use PID control for this purpose?

How can i implement PID control in s7 300?

I have no hardware PID controller. I have to create a software PID controller.

Please provide some tips to program the PLC

[sventek]

The steel rods will pass through the TMT in milliseconds.

Hi!
The process is very fast.
Analog input signal consersation time + cycle time plc + setting time analog output signal + setting time from the actuator(valve) are in summary much longer than the rod is in the TMT.
I think you should check this.

For programming a PID controller: Download or buy the software package. You can find examples in the documentation.

sventek