Motor ON OFF Logic in PLC

Develop ladder logic program for Motor ON OFF according to the logic given below,

The start button is pressed to start the conveyor motor
Cases move past the proximity switch and increment the counter’s accumulator value.
After the count of 3, the conveyor motor stops automatically and the counter’s accumulator value is reset to 0. Restart button is used to start the process from the beginning.
The conveyor motor can be stopped and started manually at any time without loss of the accumulator count.
Accumulated count of the counter can be reset manually at any time by means of the count reset button.

PLC Motor Logic

Motor Logic Explanation

Rung 0000:

Start/Stop PB latched with memory B3:0/0.

Rung 0001:

B3:0/0 enabled to turn ON conveyor motor (O:0/0 ). B3:0/1 is connected in series with normally closed contact to break the line when counter accumulator value reached 3.

Rung 0002:

B3:0/0 and proximity sensor (I:0/2) are connected in series to input the counter presented at 3 with one shot coil.

Rung 0003:

B3:0/0 and comparator block is used to enable B3:0/1 to turn OFF conveyor motor. It is also latched to avoid to restrict the motor to turn ON again. Restart button is pressed to start the process from the beginning.

Rung 0004:

Two ways are used to reset the counter, using manual reset switch and B3:0/1 when the counter accumulator reached preset value.

Program Output:

When Start PB is pressed

When three cases are passed

When the Restart button is pressed

Conclusion:

We can use this example to understand the programming logic in Allen Bradley Programmable Logic Controllers (PLC).

Comments

PLC Program for Mixing Tank

Create a ladder diagram for controlling a batch mixing process. Implement a PLC program for mixing tank or Mixing Process using PLC Ladder Logic. PLC Program for Mixing Tank Fig : Mixing tank A tank is used to mix two liquids. The required control circuit operates as follows: A. When the START button is pressed, solenoids A and B energize. This permits the two liquids to begin ﬁlling the tank. B. When the tank is ﬁlled, the ﬂoat switch trips. This de-energizes solenoids A and B and starts the motor used to mix the liquids together. C. The motor is permitted to run for 1 minute. After 1 minute has elapsed, the motor turns off and solenoid C energizes to drain the tank. D. When the tank is empty, the ﬂoat switch de- energizes solenoid C. E. A STOP button can be used to stop the process at any point. F. If the motor becomes overloaded, the action of the entire circuit will stop. G. Once the circuit has been energized, it will continue to operate until it is manually stopped. Solution...

What is Relay? How it Works? Types, Applications, Testing

We use relays for a wide range of applications such as home automation, cars and bikes (automobiles), industrial applications, DIY Projects, test and measurement equipment, and many more. But what is Relay? How a Relay Works? What are the Applications of Relays? Let us explore more about relays in this guide. What is a Relay? A Relay is a simple electromechanical switch. While we use normal switches to close or open a circuit manually, a Relay is also a switch that connects or disconnects two circuits. But instead of a manual operation, a relay uses an electrical signal to control an electromagnet, which in turn connects or disconnects another circuit. Relays can be of different types like electromechanical, solid state. Electromechanical relays are frequently used. Let us see the internal parts of this relay before knowing about it working. Although many different types of relay were present, their working is same. Every electromechanical relay consists of an consists of an Elect...

Chlorine dioxide Analyzer Principle

Chlorine dioxide measurement Chlorine dioxide (ClO2) is an instable, non-storable, toxic gas with a characteristic scent. The molecule consists of one chlorine atom and two oxygen atoms – represented in the chemical formula ClO2. It is very reactive. To avoid the risk of spontaneous explosions of gaseous chlorine dioxide or concentrated solutions, it is generally handled in dilution with low concentrations. ClO2 is soluble in water, but tends to evaporate quickly. Typically it is prepared on site, for example from hydrochloric acid and sodium chlorite. The procedure provides solutions with approx. 2 g/l ClO2 that can be safely handled and stored for several days. Image Credits : krohne Sensor Parts : Reference electrode Applied chlorine dioxide specific potential Current needed to maintain the constant potential Counter electrode Measuring electrode The disinfection effect of ClO2 is due to the transfer of oxygen instead of chlorine, so that no chlorinated byproducts are formed. C...

TILI Automation

Search This Blog