(1) How to punctuate lists in general? (2) also, what case to use?

In the case study, signal comparison could be used for:
 • signals from redundant channels of emergency stop button,
 • output signals of redundant processing units,
 • feedback signals from frequency converter and contactor,
 • also result comparison of diagnostic techniques and measures, that have dependencies. 

VS.

In the case study, signal comparison could be used for:
 • signals from redundant channels of emergency stop button;
 • output signals of redundant processing units;
 • feedback signals from frequency converter and contactor;
 • also result comparison of diagnostic techniques and measures, that have dependencies. 

VS.

In the case study, signal comparison could be used for:
 • signals from redundant channels of emergency stop button
 • output signals of redundant processing units
 • feedback signals from frequency converter and contactor
 • also result comparison of diagnostic techniques and measures, that have dependencies

VS.

In the case study, signal comparison could be used for:
 • Signals from redundant channels of emergency stop button
 • Output signals of redundant processing units
 • Feedback signals from frequency converter and contactor
 • Also result comparison of diagnostic techniques and measures, that have dependencies

(3) is ":" necessary?

(4) is it (everything) the same for all cases?