Explain check validity instruction using the example

Explain check validity instruction using the example

Application:-.Write PLC program for an explanation using ladder diagram language in the Programmable Logic Controller (PLC).

Components:-Programmable logic controller, HMI panel, wires, 24 VDC lamp, 24 VDC power source, 24VDC temperature controller.

 

Diagram:-

Explanation:-

Check arability instruction is used to check entered values in the operands. For example, we want to make the multiplication of two values and both values are INT. Here we will check both the entered value are INT and we will ensure these via instruction.

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 lamps are digital outputs. Value 1 and value 2 are input words.

M Memory:-

Value 1:-MD20

Value 2:-MD24

Result: - MD28

PLC program Explanation:-

In network 1, we have used check avaibility instruction in multiplication, here we are using MUL instruction for multiplication of two values. Two values are INT but we need to verify with instruction.

So here we have used two INT values in MUL instruction and OK instruction will check both the values (value 1 and value 2) are INT or other data types.

If both value in MD 20 and MD24 are INT, it will allow multiplication or not.