Programmable Logic Controller - Introduction/Simple Logical Experiments

Following series of posts capture experiements done with the keyence logic builder to make programs for the Programmable Logic Controller devices. These are pretty basic experiments and anyone can follow it along. These were the experiments and records i did as a student. Posting it here as a blog content.

Keyence Ladder Builder:

KV Ladder Builder can simulate program execution even without a PLC connected. Debugging efficiency is enhanced by providing a single step execution (forward and reverse) in addition to a regular scan execution function. 

Working with the tool:

Open the software here:

Start -> Programs -> Keyence Applications -> Ladder Builder for KV

Create a new file. Select the KV10 model.

Figure 1 - 1 Keyence Ladder Builder First View

Basic Table of I/O

Input Relays	0000 – 0005
Output Relays	0500 – 0503
Internal Relays	1000 – 1915
Timers/ Counters	T/C 000 – 063
Data Memory	DM 0 -0999

Ladder Editor:

Drawing the ladder logic program in ladder editor.

Relay type	Key
Normally open Input	F5
Normally closed Input	Shift + F5
Normally open Output	F7
Normally closed Output	Shift + F7
Horizontal line	F9
Vertical line	F8

 

Figure 1 - 2 Adding Bit Logic NO and NC

After drawing the ladder logic, click the bottom of the last rung.

Type END -> for end of routine . Click OK.

Below this line, Type ENDH -> for end of program. Click OK.

Click the simulator button to simulate the program.

In the simulator window execute the program for continuous scan.

Figure 1 - 3 Simulating Ladder Diagram

There are two ways to switch on an input relay.

1.       Double click with mouse button.

2.       Modify the value in the bottom of the screen.

Figure 1 - 4 Changing Status of Input

Realization of Gates

Problem Statement: To Realize Logic Gates AND, OR, NOT, XOR, NAND, NOR, XNOR gates using Ladder logic programming.

Input Output Allocation:

<Relay>

<No.> <Label> <Comment1> <Comment2> <Comment3>

0000 :INPUT1 Input Relay

0001 :INPUT2 Input Relay

0500 :ANDOUTPU And Output

0501 :OROUTPUT OR Output

0502 :NOTOUTPU NOT Output

0503 :NOROUTPU NOR Output

0504 :NANDOUTP NAND Output

0505 :XNOROUTP XNOR Output

0506 :XOROUTPU XOR Output

 

Ladder Logic Program:

Figure 1 - 5 Complete Ladder Logic Program