test PD.diff output in config

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
fail on setpoint error

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
block to calculate fuzzy logical Z

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
configure fuzzy-if-z block

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>