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Glossary
890USE19600 April 2004 59
I/O base A mounting device, designed to seat an Advantys STB I/O module, hang it on a DIN
rail, and connect it to the island bus. It provides the connection point where the
module can receive either 24 VDC or 115/230 VAC from the input or output power
bus distributed by a PDM.
I/O module In a programmable controller system, an I/O module interfaces directly to the
sensors and actuators of the machine/process. This module is the component that
mounts in an I/O base and provides electrical connections between the controller
and the field devices. Normal I/O module capacities are offered in a variety of signal
levels and capacities.
I/O scanning The continuous polling of the Advantys STB I/O modules performed by the COMS
to collect data bits, status, error, and diagnostics information.
IEC International Electrotechnical Commission Carrier. Founded in 1884 to focus on
advancing the theory and practice of electrical, electronics, and computer
engineering, and computer science. IEC 1131 is the specification that deals with
industrial automation equipment.
IEC type 1 input Type 1 digital inputs support sensor signals from mechanical switching devices such
as relay contacts and push buttons operating in normal environmental conditions.
IEC type 2 input Type 2 digital inputs support sensor signals from solid state devices or mechanical
contact switching devices such as relay contacts, push buttons (in normal or harsh
environmental conditions), and two- or three-wire proximity switches.
IEC type 3 input Type 3 digital inputs support sensor signals from mechanical switching devices such
as relay contacts, push buttons (in normal-to-moderate environmental conditions),
three-wire proximity switches and two-wire proximity switches that have:
a voltage drop of no more than 8 V
a minimum operating current capability less than or equal to 2.5 mA
a maximum off-state current less than or equal to 1.5 mA
IEEE Institute of Electrical and Electronics Engineers, Inc. The international standards
and conformity assessment body for all fields of electrotechnology, including
electricity and electronics.
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