ABB AC 31 Technical Manual page 197

Error signaled by the
error bit:
Type of error signaled
by:
Error code in:
Detailed information
in :
Information 1
Information 2
Information 3
Information 4
Hard version of unit*
Soft version of unit*
Unit serial number*
Acknowledgment
through programming
in the central unit
This acknowledgment
only acknowledges the
errors on the central
unit not those signaled
by a remote unit
Acknowledgment
through programming
in the central unit and
remote units
* Information unavailable on certain AC 31 units
Page 8-8
Diagnosis
Class 1 errors: Class 2 errors:
fatal errors serious errors
M 255.11 = 1
M 255.12 = 1
MW 254.00 MW 254.08
MW 254.01 MW 254.09
MW 254.02 MW 254.10
MW 254.03 MW 254.11
MW 254.04 MW 254.12
MW 254.05
MW 254.13
MW 254.06
MW 254.14
MW 254.07
MW 254.15
The error bit M 255.10 is 1 if any of the error bits M 255.11 to M 255.14 are at 1. The central
unit has not found an error if M 255.10 = 0.
The error bit M 255.10 is automatically reset to 0 when the error type bits are acknowledged.
A class 4 error (M 255.14=1) when MW 255.08 ≤ 15 acknowledges automatically. Class 3 or 4
type errors may be acknowledged by setting M 255.13 or M 255.14 to 0.
The information word values are updated with each new error. Resetting these words to 0 is
not automatic when acknowledged but may be achieved by writing, on-line or through
programming, a 0 value in these words.
Class 3 errors:
light errors
M 255.10 = 1
M 255.13 = 1
MW 255.00
MW 255.01
MW 255.02
MW 255.03
MW 255.04
MW 255.05
MW 255.06
MW 255.07
By setting M 255.13
to 0 after the
disappearance of the
error
With the CS31QU function block
Class 4 errors:
warnings
M 255.14 = 1
MW 255.08
MW 255.09
MW 255.10
MW 255.11
MW 255.12
MW 255.13
MW 255.14
MW 255.15
By setting M 255.14
to 0 after the
disappearance of the
error
ABB Control - AC 31
1SBC 260400 R1001-b 06.99