In PLC terminology, what does the term 'address' refer to?

• A. A label or number indicating where information is located in memory
• B. A physical connector type
• C. A hardware warranty code
• D. A communication protocol version

Answer: (A)

Addresses in PLC terms refer to the location in memory where data is stored or accessed. It’s the label or number the PLC uses to know where to read inputs, store results, or reference internal variables. The memory map or tag table links these addresses to specific I/O points or data blocks, so the program can consistently reference data such as an input at a given address or a variable tied to a memory location. The options describing a physical connector, a hardware warranty code, or a communication protocol version pertain to hardware interfaces, service terms, or communications, not to where data is stored or referenced in memory.