Explain to calculate instruction using an example.

Explain to calculate instruction using an example.

Application:-Explain to calculate instruction in the PLC. Write PLC program for explanation using ladder diagram language.

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

Explanation:-

Calculation instruction is used to define the calculation of mathematical values. Date type can be set as per the requirements. Siemens S7-1200 and S7-1500 are supporting this instruction. We can make a suitable equation by using this instruction.

For example, consider there are two values and we need to calculate the average value for these two values. In the figure, we can see 50 entered in value 1 box and enter 10 in value 2 box. Take 1 result box as shown in the figure so we can monitor the result of the instruction.

Now link these tags to calculate instruction by giving these addresses in the HMI.

PLC program:-

Write the ladder program to calculate instruction using ladder diagram language. Here for ladder logic, we can use any supported PLC a system like S7-1200, S7-1500 or any other PLC which can support this instruction.

M Memory:-

Value 1:-MW10

Value 2:-MW12

Average Value:-MW14

PLC program Explanation:-

In-network 1 we have configured calculate instruction for the average value. In this instruction we can select data type in the box (??), here select INT for our requirement. In the box (..) we can define the equation for the calculation.

IN1 (MW10) and IN2 (MW12) are the inputs operands in which we can enter values, here these values will come from the HMI. And OUT is the output operand, here we can monitor the result of the calculation.

Here IN 1=50 and IN2 =10 so average value as per the equation (IN1+IN2/2) is 30 so in a result we will get value 30 in MW 14.