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Glossary
CCD
Charge Coupled Device
Com server
A Com server represents the communication center between a serial DTE (machine,
measuring device, controller...) and the TCP/IP computer network.
Contour
Closed line that completely runs along the edge of an object, i.e. it encompasses the border
points.
Counter
A counter registers the status transitions (edges) of a digital signal. With each status
transition, the counter increases (increments) or decreases (decrements) a value that is then
evaluated by SIMATIC S7 or a PLC.
CPU
Central Processing Unit
Crossover cable
A crossover cable can only be used for a direct connection between two PCs or devices.
Due to the crossing of the send and receive wires, the PCs/devices can communicate
without additional components (HUB, switch).
Both the PC and processing unit must have an Ethernet RJ-45 port.
CSV
Character Separated Values -> A CSV file (can be read with Microsoft Excel, for example) is
a text file for saving or exchanging simply structured data.
DB
Data block
Debouncing
Permanent electrical contact does not occur immediately when electrical switching or key
contacts are closed; the connection opens and closes several times within a fraction of a
second. With digital input devices (computer keyboards, input controllers on keypads, etc.),
this bouncing effect causes each occurrence of the contact to be registered as a separate
input (multiple input). Since the discovery of the phenomenon, various hardware and
software solutions have been developed. Counteracting this effect is known as debouncing
(debouncing circuit or routine).
Glossary-2
Vision Sensor SIMATIC VS120
Operating Instructions, Edition 02/2006, A5E00757507-01
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