Diversity [t-head1-first]

The construction of control circuits according to a range of function principles or using various types of device.

Functional diversity by combination of normally open and normally break contacts

Diversity of devices due to use of various types of device (here, various types of contactor relay)

Safety barrier open

Feedback circuit

Safety barrier closed

Function tests [t-head3-col]

The correct functioning of the equipment can be tested either manually or automatically.