3.1.
/, . /.
, (, ), .
, , . , /, . , .
3.2.
(position sensor) . , , - (, ) . (limit switch) , . , , .
. 3.1 (normally open, make-contact switch), (normally closed, break-contact switch) (change-over switch) . .
. 3.1. .
(Single-Pole Single-Throw SPST), . 3.2 . (pull-up) . , +5 , - . , , .
, () , (. 3.2 ). , , - . , , .
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.3.2. .
(Single-Pole Double-Throw SPDT) (Break-Before-Make ) (Make-Before-Break ) (. 3.3). , .
SPDT . ; , , . , , .
. 3.3. :
, .
, .
. , . () .
(reed switch, reed relay) , . . , , .
, . . . , , . , , , , . , , . .
. ( ) ( ).
3.3.
, (, , , ) . (point sensors, limit sensors). , - , . .
3.4.
(level switch) , . , , . , , .
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, , . , . , . . (proximity sensors). , , . , , . ( ), ( ) .