ABB AC 31 Technical Manual page 194

Detection:
LED status
- on the central unit:
- on the extensible
remote units :
- on the extensions:
- on non-extensible
remote units:
Reaction while powering
up or during central unit
usage:
Acknowledgment after
error removal:
ABB Control - AC 31
1SBC 260400 R1001-b 06.99
Diagnosis
A recapitulative table:
Class 1 errors: Class 2 errors:
fatal errors serious errors
Immediate Immediate
ERR led on ERR led on
RUN led off even if the RUN led off even if the
RUN/STOP switch is on RUN/STOP switch is on
RUN RUN
All outputs remain on, or All outputs remain on, or
are set to, 0. are set to, 0.
The programming The programming
software no longer has software retains access
access to the central to the central unit.
unit.
The user program has
The central unit remains not started or is stopped.
on RESET while the
error remains present.
- Power on - Power on
- Software cold restart
- Software warm start or
RESET
- Software
acknowledgment
Class 3 errors: Class 4 errors:
light errors warnings
- Bus error: if the central - Unit error: the central unit
unit detects a frame queries one slave per cycle.
control error (CRC) during An error is detected
9 successive cycles between 1 and 31 cycles.
or a timing error - Program syntax error: The
or the absence of a reply central unit detects this type
from a unit. of error when passing from
- Cycle timing error: if the STOP to RUN via the
switch
system detects the
overriding of the pre- or via the software
defined cycle time after or by on-line validation of a
16 consecutive cycles.
program modification.
ERR led on ERR led on
According to the Following a program syntax
configuration, the RUN type error, the RUN led is
led is off even if the off.
RUN/STOP switch is on
RUN
ERR led on or flashing ERR led on
according to the case
Flashing SUPPLY led Flashing SUPPLY led
Error led on or flashing Error led on
according to the case
The inputs of a unit on
No program stoppage
error retain the old values
for 9 cycles and are then
reset to 0.
The outputs of a remote
unit or extension are reset
to 0.
No program stoppage by
default.
It's possible to prepare an
automatic program
stoppage with prior
configuration
(see chapter 5)
- Switch RUN/STOP from STOP to RUN
- Program launch through software
- Software warm restart
- Software cold restart
- Power on
- Software acknowledgment in the "STATUS" window"
- Acknowledgment through programming
- Test button on the 30 and 90 series remote units
- Automatic
acknowledgment if the error
code ≤ 15
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