Detailed description of the operation of the ALRM_DIA function block
(Original Document)
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Timing diagram
The following timing diagram shows how the ALRM_DIA function block works.
Function
The following table describes the different phases illustrated by the above timing diagram:
Phase
Description
1
An error is detected when the input COND1 is set to 0.
2
The error is reset when the input COND1 is set to 1.
3
An error is detected when the input COND0 is set to 1.
4
The error is reset when the input COND0 is set to 0.
5
An error is not detected when the input COND0 is set to 1, as an error already exists.
6
The error is not reset when the input COND1 is set to 1, as the input COND0 remains at 1.