In more advanced PLC designs, a more structured programming approach is taken with the use of “tags,” which are stored within the PLC’s memory in a tag database. With a Tag Database, all function ...

When a PLC is used primarily to replace relays ... which resemble examine instructions and which tell the program where to find the numbers in memory. The third and final part of an arithmetic ladder ...

Traditional PLC programming resembles a relay diagram ... the name allows several data structures of the same type to be stored. The Global Memory Map The gmm manages the global shared memory, which ...