We've selected the 1763-L16BWA MicroLogix 1100 PLC as our control system.

Step 1 - Review the datasheet and figure out how to connect the system.

By searching Google for the "MicroLogix 1100 1763-L16BWA datasheet", we find the following manual: MicroLogix 1100 Installation Instructions

On page 17, we find the following wiring diagram for the PLC. Note: Make sure to refer to the "1763-L16BWA" diagram.

We can conclude that we need to wire the two buttons ("Start" and "Stop") to the Input 0 (I/0)and Input 1 (I/1) of the PLC.

We can also conclude that we need to wire the motor contactor onto the Output 1 (O/0) of the PLC.

Note:

• We'll need to supply the PLC with 110 VAC
• We'll need to supply the "DC COM" with VDC- or VDC+ depending on the button polarity.
• We'll need to supply the Output 1 with 24VDC+ and the coil with a GND to pull in the contactor once we energize the output.

Based on the above, the following drawing can be created.

Step 2 - Programming the PLC

We can go online with the PLC through an EtherNet or RS232 connection. We've created a complete tutorial on how to establish communication with a MicroLogix PLC, set the IP address and to go online. You may review the information here: Getting Started in RSLogix 500 & MicroLogix 1100 Programmable Logic Controller

Step 2.1 - Open RSLogix 500 and Create a New Program

Step 2.2 - Identify & Label all the I/O Points

"Start" Push Button on Input 0

"Stop" Push Button on Input 1

Motor Contactor on Output 0

Step 2.3 - Build the Ladder Logic

Note: it is possible to solve this problem multiple ways. However, we recommend using the following structure that optimizes the use of the XIC and OTE instructions.

Note2: Since our "Stop" push button is Normally Closed, we use an XIC for the state of that signal. In many online examples, you'll see this instruction implemented as XIO. That's due to the fact that the button is Normally Open.

Step 2.3 - Download Logic to PLC & Go Online

We've outlined the steps on how to go online with a MicroLogix 1100 PLC in a separate tutorial. In this case, we're going to use the Emulate 500 software that can be downloaded and installed for free. We're written an extensive tutorial on how to download and install it: Download RSLogix 500, RSLogix 500 Emulate, and RSLinx for free

Once you've set the path, go online with the controller.

Step 2.4 - Test the Logic

We test our logic in the emulator by activating the appropriate inputs and watching the state of the output. In the real world, we could wire the buttons and use them to test the inputs and outputs.

Test 1 - Press the "Start" push button.

Expected Outcome - Motor Starter Energized.

Outcome - The Motor Starter is energized and the Motor is Running.

Test 2 - Release the "Start" push button.

Expected Outcome - Motor Starter Stays Energized.

Outcome - The Motor Starter stays energized and the Motor is Running.

Test 3 - Press the "Stop" push button.

Expected Outcome - Motor Starter is de-energized.

Outcome - The Motor Starter is de-energized and the Motor is Stopped.

Test 4 - Release the "Stop" push button.

Expected Outcome - Motor Starter stays de-energized.

Outcome - The Motor Starter stays de-energized and the Motor is Stopped.

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