Schneider Electric INTERBUS Basic Spécifications télécharger pdf (Page 157)

Glossary

31004624 8/2009 157

SAP

service access point. The point at which the services of 1 communications layer, as

defined by the ISO OSI reference model, is made available to the next layer.

SCADA

supervisory control and data acquisition. Typically accomplished in industrial

settings by means of microcomputers.

SDO

service data object. In CAN-based networks, SDO messages are used by the

fieldbus master to access (read/write) the object directories of network nodes.

segment

A group of interconnected I/O and power modules on an Island bus. An Island must

have at least 1 segment and, depending on the type of NIM used, may have as many

as 7 segments. The first (leftmost) module in a segment needs to provide logic

power and Island bus communications to the I/O modules on its right. In the primary

or basic segment, that function is filled by a NIM. In an extension segment, that

function is filled by an STB XBE 1200 or an STB XBE 1300 BOS module.

SELV

safety extra low voltage. A secondary circuit designed and protected so that the

voltage between any 2 accessible parts (or between 1 accessible part and the PE

terminal for Class 1 equipment) does not exceed a specified value under normal

conditions or under single-fault conditions.

SIM

subscriber identification module. Originally intended for authenticating users of

mobile communications, SIMs now have multiple applications. In Advantys STB,

configuration data created or modified with the Advantys Configuration Software can

be stored on a SIM (referred to as the “removable memory card”) and then written

to the NIM’s Flash memory.

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Schneider Electric INTERBUS Basic Spécifications Page 157