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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.
Revisions to This Manual
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.
Content of This Manual
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.