GE 90-30/20/Micro Preface

Preface

GFK-0467K iii

This manual describes the system operation, fault handling, and Logicmaster 90™ programming

instructions for the Series 90™-30, Series 90™-20 and Series 90™ Micro programmable logic

controllers. Series 90-30 PLCs, Series 90-20 PLCs, and Series 90 Micro PLCs are all members of

the Series 90™ family of programmable logic controllers from GE Fanuc Automation.

There are new 350 and 360 series CPUs. Differences in their memory limits and general operations

are specified in Chapter 2 of this manual, “System Operations.”

There are two new Service Requests and one new function in Release 9.02 of Logicmaster. Service

Request # 46, Fast Backplane Status Access, is discussed in Chapter 4, on page 4-165 and

following. The Sequential Event Recorder is a new function and discussed on page 4-114 and

following. There are also new fault reported from some of the newer CPUs. Descriptions and

corrections for those faults are discussed on page 3-8 and following.

Beginning with Release 8, the 352 CPU supported floating-point operations. Beginning with

Release 9, the 350, 351, 360, 363, and 364 CPUs also support floating-point operations, but there

are some differences between the software floating-point capabilities of those models and the

floating-point capabilities of the 352 CPU which uses a floating-point math co-processor. Those

differences are discussed in Appendix E. Also, the instructional timing information in Appendix A

includes floating-point and other instructional timing for these new models.

Chapter 1. Introduction: provides an overview of the Series 90-30 PLC, the Series 90-20 PLC,

and the Series 90 Micro PLC systems and the Series 90-30/20/Micro instruction set.

Chapter 2. System Operation: describes certain system operations of the Series 90-30 PLC,

Series 90-20 PLC, or Series 90 Micro systems. This includes a discussion of the PLC system

sweep sequences, the system power-up and power-down sequences, clocks and timers, security, I/O,

and fault handling. It also includes general information for a basic understanding of programming

ladder logic.

Chapter 3. Fault Explanations and Correction: provides troubleshooting information for a

Series 90-30, 90-20, or Micro PLC system. It explains fault descriptions in the PLC fault table and

fault categories in the I/O fault table.

Chapter 4. Series 90-30/20/Micro Instruction Set: describes programming instructions available

for Series 90-30 PLCs, Series 90-20 PLCs, Series 90 Micro PLCs. The information in this chapter

is arranged as sections that correspond to the main program function groups.

Appendix A. Instruction Timing: lists the memory size in bytes and execution time in

microseconds for each programming instruction. Memory size is the number of bytes required by

the function in a ladder diagram application program.