ACC Automation: PLC & Industrial Control Learning
Practical Tips and Techniques
A lot of times when programming a PLC you need to track what has previously happened. Shift registers allow you to do just that. The Click PLC has a shift register in the instruction set. We will discuss the shift register and look at an example.
I have been recently asked how you can move data conditionally on an excel spreadsheet once the information has been obtained from the PLC? Monthly data was being collected from the PLC and put on an excel spreadsheet using Omron CX-Server DDE. They wanted at the beginning of each month to move the data to … Read more
We are using Modbus TCP protocol, reading ten registers in the PLC, and displaying a bar graph in Excel. e will use Visual Basic for Applications (VBA) to communicate with a PLC. Previously we have used VB6 to communicate Modbus TCP. Sequence for Modbus TCP on Excel using VBA The following steps will be done: … Read more
Utilizing the CX Server DDE Manager will allow us to provide a link to the information in the Omron PLC. This link can be placed on an Excel spreadsheet. Charts, graphs, etc., can be made from the data. We will create links on an excel spreadsheet from a CQM1H and a CP1L PLC. The information … Read more
We will use VBA in Excel to communicate to an Omron PLC. This will use the serial host link protocol. ACC Omron Host Link VBA In Part 1, we used VB6 to communicate from the computer to the PLC (Host Link Protocol). We will now use Visual Basic for Applications (VBA) to accomplish the same … Read more
One of the most powerful features of the Productivity Suite software is the built-in PLC simulator. If you don’t have the physical P1-M622-16DR hardware yet—or you’re developing logic at your desk before heading to the plant floor—the simulator lets you program, modify, and test your ladder logic without a single piece of hardware connected. This … Read more
The Productivity Suite Software allows us to modify our existing program and execute the new code without stopping the PLC scan. This is referred to as online editing. We change the ladder logic code, and when we save it to the P1-M622-16DR PLC, the current PLC scan is held until the new code is written … Read more
We will now look at wiring and testing our first ladder logic program with the P1-M622-16DR Mini PLC. Having created our start-stop motor circuit and learned about the monitoring tools in the Productivity Suite Software, it’s time to connect real-world devices and see our program in action. We will wire a start pushbutton, a stop … Read more
We will now look at monitoring and testing our Productivity Mini PLC program. The Productivity Suite Software provides powerful tools for us to monitor and test our programs. Last time, we created our first program—a simple start-stop motor circuit—and transferred it to our connected P1-M622-16DR Mini PLC. We will monitor our ladder using the ladder … Read more
We will now create our first program on the Productivity Mini PLC P1-M622-16DR. Last time we connected the Mini PLC with our computer running the Productivity Suite Software. An Ethernet (RJ45) connection was established to our programmable logic controller. We will now create our first program for our Productivity Mini PLC. Our program will be … Read more