One Channel Application

Performance and Safety Integrity Levels

This table describes the performance and safety integrity levels associated to the 1 channel application:

Chronogram Convention

The inputs and outputs behavior description may be based on chronograms. In those chronograms, the following convention on signals status applies:

Output Activation

Both the safety conditions and the start conditions must be valid before allowing the activation of outputs.

Non-Monitored Start

This table presents the module types available in a 1 channel application with a non-monitored start:

This figure represents the output activation management in a 1 channel application with a non-monitored start:

 

 

Events description:

1.Non-monitored start condition is available as long as the start input is on.

The start condition can be valid before the safety input.

The outputs are on only if start + safety input conditions are valid.

2.Safety inputs + start conditions are valid

3.Safety inputs condition invalid

4.The outputs react to the safety input and start conditions with a delay given by system constraints.

Monitored Start

This table presents the module type available in a 1 channel application with a monitored start:

This figure represents the output activation management in a 1 channel application with a monitored start:

 

 

Events description:

1.Monitored start condition is triggered by a falling edge on the start input.

2.Safety inputs + start conditions are valid

3.Safety inputs condition invalid

4.The outputs react to the safety input and start conditions with a delay given by system constraints.