Test 0/ a control system A regulation system is constituted of three interconnected regulators (R1, R2 and R3), each performing the regulation of a unit. A tester is linked to these three regulators in order to apply to them test sequences at the time of periods of inactivity (see Figure 16.2 and sub-section 16.2.1). We assume that R1 is stopped once a week during 1 hour, that R2 is at rest each morning from 6H to 6H30' , and that R3 can be interrupted 10 minutes every hour.

1. Study the work of the tester, its needs in terms of actions on the regulators, and the periodicity of the average test of the equipment, by assurning that the sequences making the complete test of each regulator spend less than 6 minutes.

2. What must we do if the test duration is increased to 15 minutes?

3. Exarnine the problem of the management of the test of a regulator when the test activity is split into several elementary tasks Ti.