GE 90-30/20/Micro manual System Operation

Chapter

2

System Operation

This chapter describes certain system operations of the Series 90-30, 90-20, and Micro PLC systems. These system operations include:

∙A summary of PLC sweep sequences (see Section 1).

∙Program organization and user references/data (see Section 2).

∙Power-up and power-down sequences (see Section 3).

∙Clocks and timers (see Section 4).

∙System security through password assignment (see Section 5).

∙Model 30 I/O modules (see Section 6).

GFK-0467K 2-1