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Glossary

31004624 8/2009 161

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.

VPCW object

virtual placeholder configuration write 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 where the fieldbus master can write

a module reconfiguration. After the fieldbus writes to the VPCW subindex, it can

issue a reconfiguration request to the NIM that begins the remote virtual placeholder

operation.

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Schneider Electric INTERBUS Basic Specifiche Pagina 161