IFM Electronic CR0403 Programming Manual page 224

ifm Programming Manual ecomatmobile
Glossary of Terms
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System variable
Variable to which access can be made via IEC address or symbol name from the PLC.
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T
Target
The target contains the hardware description of the target device for CODESYS, e.g.: inputs and
outputs, memory, file locations.
Corresponds to an electronic data sheet.
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TCP
The Transmission Control Protocol is part of the TCP/IP protocol family. Each TCP/IP data connection
has a transmitter and a receiver. This principle is a connection-oriented data transmission. In the
TCP/IP protocol family the TCP as the connection-oriented protocol assumes the task of data
protection, data flow control and takes measures in the event of data loss. (compare: →UDP)
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Template
A template can be filled with content.
Here: A structure of pre-configured software elements as basis for an application program.
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U
UDP
UDP (User Datagram Protocol) is a minimal connectionless network protocol which belongs to the
transport layer of the internet protocol family. The task of UDP is to ensure that data which is
transmitted via the internet is passed to the right application.
At present network variables based on →CAN and UDP are implemented. The values of the variables
are automatically exchanged on the basis of broadcast messages. In UDP they are implemented as
broadcast messages, in CAN as →PDOs.
According to the protocol, these services are unconfirmed data transmission: it is not checked whether
the receiver receives the message. Exchange of network variables corresponds to a "1 to
n connection" (1 transmitter to n receivers).
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Use, intended
Use of a product in accordance with the information provided in the instructions for use.
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W
Watchdog
In general the term watchdog is used for a component of a system which watches the function of other
components. If a possible malfunction is detected, this is either signalled or suitable program
branchings are activated. The signal or branchings serve as a trigger for other co-operating system
components to solve the problem.
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wo
WO = write only
Unidirectional data transmission: Data can only be changed and not read.
BasicController (CR0403) Runtime System V03.02
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2015-04-01