GFK-0467K 3-1
Fault Explanation and Correction
This chapter is an aid to troubleshooting the Series 90-30, 90-20, and Micro PLC systems. It
explains the fault descriptions, which appear in the PLC fault table, and the fault categories, which
appear in the I/O fault table.
Each fault explanation in this chapter lists the fault description for the PLC fault table or the fault
category for the I/O fault table. Find the fault description or fault category corresponding to the
entry on the applicable fault table displayed on your programmer screen. Beneath it is a description
of the cause of the fault along with instructions to correct the fault.
Chapter 3 contains the following sections:
Section Title Description Page
1Fault Handling Describes the type of faults that may occur in the
Series 90-30 and how they are displayed in the fault
tables. Descriptions of the PLC and I/O fault table
displays are also included.
3-2
2PLC Fault Table
Explanations Provides a fault description of each PLC fault and
instructions to correct the fault. 3-7
3I/O Fault Table
Explanations Describes the Loss of I/O Module and Addition of I/O
Module fault categories. 3-17
3
Chapter