Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module - Manual (Page 121)

Publication 1756-UM007C-EN-P - November 2011
Glossary 121
sensor A digital or analog transducer (a device such as a limit switch, push button
switch, pressure sensor, or temperature sensor) that generates an electrical
signal through an input circuit to a controller.
single-ended 1) Unbalanced, as when one side is grounded. See unbalanced circuit
( page 121 ) 2) Contrasted with differential ( page 117 ).
synchronous 1) In step or in phase, as applied to two or more circuits, devices, or machines.
2) Contrasted with asynchronous ( page 115 ).
tag A named area of the controller’s memory where data is stored like a variable.
For example, an I/O definition file may contain a tag (definition) for each I/O, with
each I/O definition containing a unique tag name by which the I/O can be
addressed.
unbalanced circuit 1) A circuit whose two sides are electrically dissimilar, as when one side is
grounded. 2) Contrasted with balanced circuit ( page 115 ).