Interruptions; Programming Interruptions - ABB AC 31 Technical Manual

2. Interruptions

2.1. Programming interruptions

ABB Control - AC 31
1SBC 260400 R1001-b 06.99
Program Optimization
The immediate treatment of information and rapid execution of certain tasks may be necessary
and are processed with interruptions.
Their processing, in this case, is independent of the central unit cycle time.
The central units can manage 2 interruption types:
- Alarms, through the I62.02 and I62.03 inputs
- Cyclic, based on a time
The alarms allow you to immediately take into account an external information, independently
of the central unit cycle time.
A cyclic interruption allows you to execute tasks at regular intervals. For example, control
management.
Interruptions are defined in the AC31GRAF programming software with the "Modularize" option
in the "New" menu followed by "Create a new program" (see Figure 6-3).
The programming language is either Quick Ladder, FBD/LD or Instruction List.
The interruption on the I62.02 input is designated by # 1 and by a name. The one on the I62.03
input is designated by # 2 and a name. A cyclic interruption is designated by a name and a time
value in milliseconds.
For example: the interruption on the I62.02 input is called INT1, that on the I62.03 input is
called INT2 and the cyclic interruption is called INT3 with a time base of 30 ms (see Figure
6-4).
All of the functions or instructions may be used in an interruption.
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