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3-12 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
3
Constant Sweep Time Exceeded
The Fault Group Constant Sweep Time Exceeded occurs when the PLC CPU operates in
CONSTANT SWEEP mode, and it detects that the sweep has exceeded the constant sweep timer.
The fault extra data contains the actual time of the sweep in the first two bytes and the name of the
program in the next eight bytes. The fault action for this group is Diagnostic.
Correction:
(1) Increase constant sweep time.
(2) Remove logic from application program.
Application Fault
The Fault Group Application Fault occurs when the PLC CPU detects a fault in the user program.
The fault action for this group is Diagnostic, except when the error is a Subroutine Call Stack
Exceeded, in which case it is Fatal.
Error Code:
7
Name:
Subroutine Call Stack Exceeded
Description:
Subroutine calls are limited to a depth of 8. A subroutine can call another
subroutine which, in turn, can call another subroutine until 8 call levels
are attained.
Correction:
Modify program so that subroutine call depth does not exceed 8.
Error Code:
1B
Name:
Comm Req Not Processed Due To PLC Memory Limitations
Description:
No-wait communication requests can be placed in the queue faster than they can
be processed (e.g., one per sweep). In a situation like this, when the
communication requests build up to the point that the PLC has less than a
minimum amount of memory available, the communication request will be
faulted and not processed
Correction:
Issue fewer communication requests or otherwise reduce the amount of mail
being exchanged within the system.
Error Code:
5A
Name:
User Shut Down Requested
Description:
The PLC operating software (function blocks) generates this informational alarm
when Service Request #13 (User Shut Down) executes in the application
program.
Correction:
None required. Information-only alarm.