Explain equal instruction using example

Explain equal instruction using example

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

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

Diagram:-

Explanation:-

Consider a simple example for explanation of equal instruction in the PLC. Here we have taken simple HMI (Human Machine Interface) for display and programmable Logic Controller (PLC) for programming. Take two value set value 1 and set value 2 for example. Here if both the value in the set value 1 and set value 2 equal then lamp will be ON. So we need to use == instruction for above example.

Enter 50 value in the set value 1 box and enter 50 value in the set value 2 box so lamp should be ON and if someone enter 25 value in the set value 2 box, lamp should not be ON.

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 lamp is digital output. Two set values from the HMI are input words.

Digital Output:-

Lamp=Q0.0

M Memory:-

Set value 1:-MW10

Set Value 2:-MW12

PLC program Explanation:-

In network 1 we tow values are compared with comparison instruction. Set value 1 (MW) is compared with Value 2 (MW12).Hence if both values are equal, lamp (Q0.0) will be ON.

In comparator instruction, two operands are compared, we can set data time in comparator instruction.

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Explain greater than instruction using example

Application:-Explain greater than instruction in the PLC. Write PLC program for 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:-

Consider a simple temperature controller example for explanation of greater than (>) instruction in the Programmable Logic Controller (PLC). Here we have considered simple HMI (Human Machine Interface) for display and programmable Logic Controller (PLC) for programming. Consider one temperature control which is displaying the temperature given by temperature sensor, here we haven’t considered analog signal calculation and scaling so we directly consider actual value in the PLC. Here if the actual temp value in the actual temp box is greater than set temp, temperature indication will be ON.

If set temperature is 100 degree and temperature read by temperature controller is more than 100 degree or consider 102 degree, lamp should be ON because 102 degree is greater than 100 degree.

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 lamp is digital output. Set temp is the input word.

Digital Output:-

Temp Lamp=Q0.0

M Memory:-

Set temp.:-MW10

Actual temp:-MW20

PLC program Explanation:-

In network 1 actual temperature (MW10) will be compared with set temperature (MW20). So if the measured temperature (MW10) is greater than set temperature (MW20), temperature indication lamp (Q0.0) will be ON

In greater or equal (>) instruction, two operands are compared, we can set data type in comparator instruction.