an output in a ladder logic program can be controlled by

Condition: Case 1: Following conditions should be satisfied to start a motor. PLC Ladder Diagram Program Example for Running Motor: Problem Statement: Write a program for a simple motor with the following conditions. When you assign an address to the OTL instruction that corresponds to the address of a physical output, the output device wired to the screw terminal is energized when the bit is set. In the ladder diagram program, the switches are considering as inputs and load are considering as coil or output.

An alternative way of programming to achieve the same effect is to use a master control relay. Ladder logic can examine a bit controlled by OTL as often as necessary.A whole block of outputs can be simultaneously turned off or on by using the some internal relay contacts in each output rung so that switching it on or off affects every one of the rungs.Then use the stop switch (input I1) to unload the output causing the horizontal arm to retract (unload Output O1). When the start switch is activated load the output which extends the horizontal arm (Output O1). But if the program is applied to PLCs, the rules are executed sequentially through software and in a continuous loop. Lab Work 1: A Simple Test Program 1.To get started, construct a ladder logic diagram that is initiated by the start switch (input I0).

Each rung in the ladder represents a rule, so when it is implemented to relays and various electromechanical devices, these rules execute simultaneously and immediately. Processor gets these I/O address and depending on. Here in this example, switches are connected to the input module and lamps are connected to the output module.

Ladder logic is described as a rule-based language rather than a procedural one. The ladder logic diagram that turn ON switch 1 and switch 2 for controlling lamp1 and either switch 3 or switch 4 or both for controlling lamp2 is shown below along with wiring diagram.

It looks like vertical rails and the relay symbols look like rungs in a ladder.

The language evolved from originally being a method for documenting the design and construction of relay racks used in manufacturing and process control, where each relay rack is represented by a symbol on the ladder diagram that has connections to devices below them.

They are based on circuit diagrams and are mostly used in developing programs/software for programmable logic controllers (PLC), used in industrial applications.

Ladder logic is basically a programming language that creates and represents a program with the help of ladder diagrams which primarily consists of virtual relay contacts and coils.

An output in a ladder logic program can be controlled by