Installation manual

Publication 1747-RM001G-EN-P - November 2008
Troubleshooting Faults 16-7
0021 A remote power failure of an
expansion I/O chassis has occurred.
Note: A modular system that
encounters an over-voltage or
over-current condition in any of its
power supplies can produce any of
the I/O error codes listed on pages
page 16-12 through page 16-14
(instead of code 002). The
over-voltage or over-current condition
is indicated by the power supply LED
being off.
Fixed in FRN 1 to 4 SLC 5/01
processors: Power was removed or
the power dipped below specification
for an expansion chassis.
SLC 5/02 processors and above and
FRN 5 SLC 5/01 processors: This error
code is present only while power is
not applied to an expansion chassis.
This is the only self-clearing error
code. When power is re-applied to
the expansion chassis, the fault will
be cleared.
Fixed and FRN 1 to 4 SLC 5/01
processors: Cycle power on the local
chassis.
SLC 5/02 processors and above and
FRN 5 SLC 5/01 processors: Re-apply
power to the expansion chassis.
0022 The user watchdog scan time has
been exceeded.
• Either Watchdog time is set
too low for the user program,
or
• user program caught in a loop.
• Either increase the watchdog
timeout in the status file
(S:3H), or
• correct the user program
problem.
0023 Invalid or non-existent STI interrupt
file.
• Either an STI interrupt file
number was assigned in the
status file, but the subroutine
file was not created, or
• the STI interrupt file number
assigned was 0, 1, or 2.
• Either disable the STI
interrupt setpoint (S:30) and
file number (S:31) in the
status file, or
• create an STI interrupt
subroutine file for the file
number assigned in the status
file (S:31). The file number
must not be 0, 1, or 2.
0024 Invalid STI interrupt interval (greater
than 2550 ms or negative).
The STI setpoint is out of range
(greater than 2550 ms or negative).
• Either disable the STI
interrupt setpoint (S:30) and
file number (S:31) in the
status file, or
• create an STI interrupt routine
for the file number referenced
in the status file (S:31). The
file number must not be 0, 1,
or 2.
Table 16.3 Run Errors (Continued)
Error Code
(Hex)
Description Probable Cause Recommended Action
ATTENTION
Fixed and FRN 1 through 4 SLC 5/01 processors: If the remote power failure occurred while the
processor was in the REM Run mode, error 0021 will cause the major error halted bit (S:1/13) to
be cleared at the next powerup of the local chassis.
SLC 5/02 and above processors and FRN 5 SLC 5/01 processors: Power to the local chassis does
not need to be cycled to resume the REM Run mode. Once the remote chassis is re-powered,
the CPU will restart the system.