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viii Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K
Elapsed Time Clock........................................................................................................2-34
Time-of-Day Clock .........................................................................................................2-34
Watchdog Timer .............................................................................................................2-35
Constant Sweep Timer....................................................................................................2-35
Time-Tick Contacts.........................................................................................................2-35
Section 5: System Security................................................................................ 2-36
Passwords........................................................................................................................2-36
Privilege Level Change Requests ...................................................................................2-37
Locking/Unlocking Subroutines .....................................................................................2-37
Permanently Locking a Subroutine ..........................................................................2-37
Section 6: Series 90-30, 90-20, and Micro I/O System ................................. 2-38
Model 30 I/O Modules....................................................................................................2-39
I/O Data Formats.............................................................................................................2-41
Default Conditions for Model 30 Output Modules.........................................................2-41
Diagnostic Data...............................................................................................................2-41
Global Data .....................................................................................................................2-42
Model 20 I/O Modules....................................................................................................2-42
Micro PLCs.....................................................................................................................2-43
Chapter 3 Fault Explanation and Correction..................................................................... 3-1
Section 1: Fault Handling.................................................................................. 3-2
Alarm Processor................................................................................................................3-2
Classes of Faults ...............................................................................................................3-2
System Reaction to Faults.................................................................................................3-3
Fault Tables ................................................................................................................3-3
Fault Action................................................................................................................3-4
Fault References................................................................................................................3-4
Fault Reference Definitions..............................................................................................3-5
Additional Fault Effects....................................................................................................3-5
PLC Fault Table Display ..................................................................................................3-5
I/O Fault Table Display.....................................................................................................3-5
Accessing Additional Fault Information...........................................................................3-6
Section 2: PLC Fault Table Explanations........................................................ 3-7
Fault Actions.....................................................................................................................3-8
Loss of, or Missing, Option Module ..........................................................................3-8
Reset of, Addition of, or Extra, Option Module.........................................................3-9
System Configuration Mismatch..............................................................................3-10
Option Module Software Failure..............................................................................3-11
Program Block Checksum Failure............................................................................3-11
Low Battery Signal...................................................................................................3-11
Constant Sweep Time Exceeded ..............................................................................3-12