According to the test, the programmer of PLC can't be realized: _ _ _ _ _ _. A. monitor and monitor the running status of PLC. B. enter or edit user programs. Debug and test run the user program. Expand the capacity of user memory. The answer is D, so it is not suitable to use plc to expand the capacity of user memory.

The English full name of PLC is ProgrammableLogicController, and the Chinese full name is Programmable Logic Controller. The definition is: an electronic system for digital operation specially designed for application in industrial environment.