Introduction

This chapter provides information on diagnostics that can be performed via hardware indications (based on LED status) and system bits or words when necessary. The entire M580 system diagnostics is explained in the Modicon M580 System Planning Guide.

The CPU manages different types of detected error:

• detected errors that can be recovered and do not change the PAC behavior unless specific options are used

• detected errors that cannot be recovered and lead the CPU to the halt state

• CPU or system detected errors that lead the CPU to an error state