GE 90-30/20/Micro Manual De Usuario
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GFK-0467K
2-1
System Operation
This chapter describes certain system operations of the Series 90-30, 90-20, and Micro PLC
systems. These system operations include:
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).
2
Chapter