GE 90-30/20/Micro manual

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an alert, such as a low battery signal to indicate that the voltage of the battery protecting the memory is low and should be replaced. The condition or failure is called a fault.

Faults are handled by a software alarm processor function that records the faults in either the PLC fault table or the I/O fault table. (The Model 331 and Model 340/341 CPUs also time-stamp the faults.) These tables can be displayed through the programming software on the PLC Fault Table and I/O Fault Table screens in Logicmaster 90-30/20/Micro software using the control and status functions.

Additional Reference Information:

See the appendices in the back of this manual.

Appendix A lists the memory size in bytes and the execution time in microseconds for each programming instruction.

Appendix B describes how to interpret the message structure format when reading the PLC and I/O fault tables.

Appendix C lists the instruction mnemonics used with Logicmaster 90-30/20/Micro software.

Appendix D lists the special keyboard assignments used with Logicmaster 90-30/20/Micro software.

Appendix E provides special considerations and instructions for using floating-point math (available only on the 350 and 360 series of 90-30 CPUs).

1-2 Series 90-30/20/Micro Programmable Controllers Reference Manual– September 1998 GFK-0467K