ABB AC 31 - 4.3. Class error descriptions:

Diagnosis
Page 8-10 ABB Control - AC 31
1SBC 260400 R1001-b 06.99
4.3. Class error descriptions:
4.3.1. Class 1 error descriptions
Class 1 error descriptions
Error code in
MW254.00
Dec Hex
Info 1 in
MW 254.01
Info 2 in
MW 254.02
Info 3 in
MW 254.03
Flash EPROM checksum error - - - -
-
4.3.2. Class 2 error descriptions
Class 2 error descriptions
Error code in
MW254.08
Dec Hex
Info 1 in
MW 254.09
Info 2 in
MW 254.10
Info 3 in
MW 254.11
Defective RAM (user program or
data memory)
128
D
80
H
Memory address - -
Too many simultaneous timers
active on the central unit during
program execution (maximum 42)
255
D
FF
H
---
4.3.3. Class 3 error descriptions
Class 3 error descriptions
Error code in
MW255.00
Dec Hex
Info 1 in
MW 255.01
Info 2 in
MW 255.02
Info 3 in
MW 255.03
Unit disconnected 15
D
0F
H
Unit type Address
-
CS 31 bus error (no units
connected to the bus)
Note: If there are only analog units
connected to the CS 31 bus, then
this error could occur when
powering up while the analog units
aren’t initialized.
Reason: Analog units have a
lengthy initialization period. They
are recognized thereafter by the
central unit
16
D
10
H
---
NCB or NCBR error
Note: one of the CS 31 lines is
defective. Check the red Led status
of the NCB or NCBR to find out
which one is at fault.
17
D
11
H ---
Superposed address 18
D
12
H
Cycle time too short 200
D
C8
H ---