Level indications in the HMI for the water tank.
Application: - There is one level tank in the system and we need to show levels of tanks in the display. Write the PLC program using ladder diagram language.
Explanation:-
In above application we will not consider all system. We need to add additional feature in the existing system. System already running but we want to add level sensor indication in the display so operator can see level of the tank easily. And he can manage system by observing level in the display.
PLC program:-
Write the ladder program for above application using ladder diagram language. Here for ladder logic we can use any supported PLC system like S7-1200, S7-300, S7-1500 or any other PLC which can support this instruction. For PLC logic we need digital inputs and outputs.
For our application high level and low level are digital inputs.
Digital inputs:-
Low level=I0.0
High level=I0.1
M memory:-
Low level indication=M0.0
High level indication=M0.1
PLC program Explanation:-
In network 1, we have taken NO contact of low level sensor (I0.0) and operate M coil (M0.0) for low level indication in the display.
In network 2, we have taken NO contact of high level sensor and operate M coil (M0.1) for high level indication in the display
NO contact and NC contact is depended on the sensor type. If you have NPN type sensor then we can use NC contact also.
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