13.1 PROGRAM VS VARIABLE MEMORY 275

13.2 PROGRAMS 276

13.3 VARIABLES (TAGS) 277

13.3.1 Timer and Counter Memory 279

13.3.2 PLC Status Bits 281

13.3.3 User Function Control Memory 283

13.4 SUMMARY 284

13.5 PRACTICE PROBLEMS 284

13.6 ASSIGNMENT PROBLEMS 284

13.1 PRACTICE PROBLEM SOLUTIONS 285