Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 26)

An Introduction to
Programmable Controllers
Chapter 2
2Ć12
The processor scans the program. Our program states that if (conditions) input
bit 02 is on, turn on output 02. If input bit 02 is off then output bit 02 is off.
Since the alter condition is not true, the processor turns off output bit 02.
When the processor next scans the output image table, it sees the zero in output
bit 02 and responds by de-energizing output terminal 02. The action causes the
conveyor to stop.
We reviewed fundamentals common to A-B processors. The next chapter
summarizes hardware features of the Mini-PLC-2/05 processors.
Chapter Summary