Specifications

Glossary
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subnet A part of a network that shares a network address with the other parts of a network.
A subnet may be physically and/or logically independent of the rest of the network.
A part of an internet address called a subnet number, which is ignored in IP routing,
distinguishes the subnet.
surge
suppression
The process of absorbing and clipping voltage transients on an incoming AC line or
control circuit. Metal-oxide varistors and specially designed RC networks are
frequently used as surge suppression mechanisms.
TC thermocouple. A TC device is a bimetallic temperature transducer that provides a
temperature value by measuring the voltage differential caused by joining together
two different metals at different temperatures.
TCP transmission control protocol. A connection-oriented transport layer protocol that
provides reliable full-duplex data transmission. TCP is part of the TCP/IP suite of
protocols.
telegram A data packet used in serial communication.
TFE transparent factory Ethernet. Schneider Electric’s open automation framework
based on TCP/IP.
Tx transmission. For example, in a CAN-based network, a PDO is described as a
TxPDO of the device that transmits it.
UDP user datagram protocol. A connectionless mode protocol in which messages are
delivered in a datagram to a destination computer. The UDP protocol is typically
bundled with the Internet Protocol (UPD/IP).
varistor A 2-electrode semiconductor device with a voltage-dependant nonlinear resistance
that drops markedly as the applied voltage is increased. It is used to suppress
transient voltage surges.
voltage group A grouping of Advantys STB I/O modules, all with the same voltage requirement,
installed directly to the right of the appropriate power distribution module (PDM) and
separated from modules with different voltage requirements. Never mix modules
with different voltage requirements in the same voltage group.
VPCR object virtual placeholder configuration read object. A special object that appears in the
CANopen object dictionary when the remote virtual placeholder option is enabled in
a CANopen NIM. It provides a 32-bit subindex that represents the actual module
configuration used in a physical Island.
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