The document provides instructions for writing and running a basic input/output program on a PLC. It describes how to: 1. Input a simple ladder logic program using input switches to control output lamps. 2. Convert the program for the PLC to recognize and run it, checking for errors. 3. Write the program to a virtual PLC and observe it running, checking the RUN indicator is lit. 4. Control lamps in the program using different input conditions like normally closed/open contacts, serial AND, and parallel OR logic.

1. Basic I/O Program
Chapter 1 Description of Inputs and Outputs
Light the output lamps using the input switches.
CAUTION
Click the ladder program area to enable operation. The title bar will turn blue.
Key operations are not enabled when the title bar and menu items are grayed out.
1 Click [Edit Ladder] button on the remote control.
2 Only the 'END' symbol is displayed on the screen.
An 'END' rung at the top of the program signals that no other programming steps exist.
3 Input the program below.
Place the cursor inside the ladder diagram on the left hand side and begin to input data.
These symbols can be input by pressing the following keys.
4 Let's convert the program you have written into a form the PLC can recognize.
Press the [F4] key.
The background of the program is changed from gray to white.
The program has been converted.
If the program has not been input properly, a conversion error message is displayed.

2. Did you get it right?
No Yes (Go to the next step.)
Basic I/O Program
Chapter 2 Program Transfer to PLC
Let's write the program you have created to the PLC.
An actual PLC is not required because a virtual FX Series PLC is already in your computer.
1 The program can be written to the PLC by selecting "Online" - "Write to PLC" in the ladder program area.
2 When the message 'Write completed. The simulation will start.' is displayed, select [OK].
The PLC starts to operate.
The 'RUN' indicator lamp should be lit in the I/O monitor display area of the PLC.
If it is not lit, the PLC is not operating.
Next, let's simulate the program you have created.
Go to the next step.
Basic I/O Program
Chapter 3 Lamp Control
Can you light the operation status lamp using your program?
1 The lamp Stop (Y1) has been lit.
This is a 'NC (Normally Closed) contact' which turns the output ON when [PB1] (X20) on the operation panel is
OFF.
If [PB1] (X20) is pressed, the lampis turned OFF
2 In the example below, when [PB1] (X20) on the operation panel is pressed, the lamp is lit.
This is a 'NO (Normally Open) contact' which turns the output ON when the input is ON.
Did you get it right?
No Yes (Go to the next step.)
Basic I/O Program
Chapter 4 Lamp Control with Conditions

3. Light the lamp indicating the operation status using multiple input conditions.
1 Turn ON [SW1] (X24) on the operation panel.
2 When [PB2] (X21) on the operation panel is pressed, the lamp Error (Y2) is lit.
X24 and X21 are configured as 'Serial AND' which operates the output when all the contacts are set ON.
3 When [PB3] (X22) on the operation panel is pressed, the lamp Error (Y2) is lit.
X21 and X22 are 'Parallel OR' which operates the output when either contact is set ON.
Did you get it right?
No Yes (Go to the next step.)