What term describes a label or number indicating where information is located in a PLC's memory?

• A. Address
• B. Channel
• C. Port
• D. Tag name

Answer: (A)

An address is how you locate a specific place in a PLC’s memory. It tells the controller exactly where data lives so it can be read or written. A tag name is just a readable label programmers use to reference that location, but it maps to an underlying memory address. A channel describes a communication path, and a port is a physical connection point. So the label that indicates where information is stored in memory is the address.