Central Unit Reaction To Class 3 Errors; Initialization Of The Cs 31 Bus Units - ABB AC 31 Technical Manual

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Programming

4.1.9. Central unit reaction to class 3 errors

The AC 31 central units possess a diagnosis system aimed at ensuring a rapid and efficient
localization of faults. This diagnosis system is divided into 4 error classes:
- Class 1: fatal error
- Class 2: serious error
- Class 3: light error
- Class 4: warning
In the case of a class 1 or 2 error, the program has aborted or has not launched. For a class 4
error, the program has not stopped.
In the case of a class 3 error, it is possible to abort or continue the program:
No stoppage if the "PLC reaction to class 3 errors" configuration parameter is set to
"Warning" (configuration by default).
Automatic program stoppage by selecting "Abort".
A change of this parameter is taken into account immediately

4.1.10. Initialization of the CS 31 bus units

This parameter only acts on the 50 series central units if the central unit has been configured
as a master .
The central unit interrogates the remote units, one after the other, thereby composing an
image of the system configuration during initialization.
By default, the program launches independently of the initialization of the CS 31 bus remote
units and without taking them into account in the bus cycle:
The "Initialization of the CS 31 system after power ON, warm start or cold start"
configuration parameter = 0.
It is possible to configure the user program launch according to the initialization and taking into
account the remote units in the CS 31 bus cycle:
If the "Initialization of the CS 31 system after power ON, warm start or cold start"
configuration parameter = n (1 ≤ n ≤ 31), the user program will not launch before a minimum
number of n remote units have not been initialized in the CS 31 bus cycle.
The number of units effectively recognized by the central unit is accessible in the bits 8 to 15 of
the variable IW 062.15. The following example shows how to read this value in
MW 000.00 (KW 001.01 = 256).
%IW062.15
%KW001.01
Any change to this parameter becomes effective as from the next initialization of the master
central unit.
DIV
%MW000.00
ABB Control - AC 31
1SBC 260400 R1001-b 06.99