Converter Instruction in Siemens PLC Programming

Let’s study the working of converter instruction in Siemens PLC programming using different ladder logics and programs.

Converter Instruction in PLC

Block Description

Round to double integer:

It reads the input floating point value and converts it to double integer and round to nearest integer. The result is output by the parameter OUT.

Truncate double integer part:

It reads the input floating point value and converts it to double integer and round to zero mode. The result is output by the parameter OUT.

Ceiling:

It reads the input floating point value and converts it to double integer. The result is the lowest integer which is greater than the floating point number i.e Round to + infinity mode. The result is output by the parameter OUT.

Floor:

It reads the input floating point value and converts it to double integer. The result is the greatest integer component which is greater than the floating point number i.e Round to -infinity mode. The result is output by the parameter OUT.

Ladder Logic

Ladder Description:

Network 1:

If I0.0 is pressed, value in MD0 (99.78) is read as a floating point number and converted to the closest double integer(100). The result of round to integer is stored in MD4(100).

Network 2:

If I0.0 is pressed, value in MD0 (99.78) is read as a floating point number and converted to the double integer. The integer part of the floating point number is the result. The result is stored in MD12 (99).

Network 3:

If I0.0 is pressed, value in MD0 (99.78) is read as a floating point number and converted to the double integer by round function . The result is stored in MD12 (100).

Network 4:

If I0.0 is pressed, value in MD0 (99.78)is read as a floating point number and converted to the double integer by the round to – infinity mode. The result is stored in MD16(99).

Note: For positive numbers, trunc and floor give the same result. But for negative numbers, floor rounds down and trunc rounds up. This is because trunc always rounds toward 0.

-END-

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...

Ferrules and Cross Ferruling

Ferrules are identification labels provided for every wire terminations in an instrument, equipment, or electrical/instrumentation control panels. These tube-shaped sleeves can be inserted easily on each individual wire in a multi-core cable. In earlier days fixed digits/letters are used as ferrules, but now Instrumentation engineers/technicians prints out desired ferrules by using a ferrule printing machine. Typical Ferrule The numbers/ letters on the ferrules will be given as per the approved electrical hook up or loop diagrams. This helps technicians to easily identify a particular loop/wiring from a series of terminal blocks and to troubleshoot the desired terminal connection. Separate numbers on the ferrules distinguish the positive and negative polarities of wires, thus ensure the polarity protection of the instrument. Cross Ferruling As a wire is connected on its both ends, it is quite useful to use a cross reference method for wire identification. Unlike normal ferru...

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...

TILI Automation

Search This Blog