The assignment list tool has been discussed in many previous lessons as a valued addition to your troubleshooting repertoire. In this lesson, we will discuss yet another purpose for this tool. Frequently, when you download your program to the PLC for the first time or are using the simulator to test your program and the CPU is indicating all is well yet the program is not functioning as expected, you may have an address conflict. The assignment list may very well help you discover that you have some addresses overlapping. When you have duplicate uses for an address, the program will likely not function as intended. Let’s explore this troubleshooting option in this installment of the assignment list tool.