This is the most cost effective solution, meeting the needs of a simple small system. Changes are difficult.

2) Automate link to a console equipped with control and signalling units and / or an operator terminal.

This solution can be upgraded to allow message information at the operator terminal.

3) Automate linked to a supervision computer

This is the solution for a new system, providing better computer and printer follow up and traceability.

Supervision provides a full and instant view of the system and value display.

It can also be the first step towards more efficient maintenance management.

In addition, it is possible to integrate control programmes on all these systemes, providing even operation based on the operator's settings.
Written fault memorisation and display allow the maintenance personnel to limit its time in a dusty and noisy environment..
- System cycle start, stop and start time
- Empty and loaded operation hours
- Tons produced
- Blocking faults,
- End of day logs
- etc...
 
4) Automation computer and supervision using a field bus

This solution can be used for an extended system and provides the same advantages as solution 3, combining the automation and supervsion function with the risk of data processing in this environment.

Conclusion :

The risk associated with data processing systems is frequently underlined in the industry, with conventional solutions. 
The debate is far from being closed, because both solutions offer advantages and disadvantages.
However, there is increasing progress towards industrial data processing :

 For cost reasons : The price of components is going down.

 The reliability of computers is getting better every day, even if there are failures in dusty environments.

 Above all, this technology offers ease of use (communication, software, user friendliness) attractive to the end user.

Whatever the solution, automated systems are highly reliable, meet producers' new expectations and make it possible to achieve industrial standardised granular products.