Specifications

Glossary
EIO0000000051 6/2010 271
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.
single-ended inputs
An analog input design technique whereby a wire from each signal source is
connected to the data acquisition interface, and the difference between the signal
and ground is measured. For the success of this design technique, 2 conditions are
imperative: the signal source must be grounded, and the signal ground and data
acquisition interface ground (the PDM lead) must have the same potential.
sink load
An output that, when turned on, receives DC current from its load.