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Glossary
Infrarot
Acronym: IR. Having a frequency in the electromagnetic spectrum in the range just
below that of red light. Objects radiate infrared in proportion to their temperature.
Industrial Ethernet
Bus system based on the Ethernet standard. Components of the SIMATIC S5 and
S7 series (programming devices, programmable logic controllers, programmable
control systems) can be networked using Industrial Ethernet NICs.
Interface module
Module for the connection of peripheral hardware.
Interrupt
When the processor receives an interrupt, it suspends its current operations, saves
the status of its work, and transfers control to a special routine known as an
interrupt handler. This routine processes an instruction set to deal with the
particular situation that caused the interrupt. Interrupts can be generated by
various hardware devices to request service or report problems.
Interface
• An interface is the connection between individual hardware elements such as
PLCs, programming devices, printers, or monitors via physical connections
(cables).
• An interface is also the connection between different programs, to enable them
to work together.
Interface Module
Module which controls and extends the hardware periphery.
IRQ
Acronym for interrupt request. One of a set of possible hardware interrupts,
identified by a number. The number of the IRQ determines which interrupt handler
will be used. In the AT bus, ISA, and EISA, 15 IRQs are available. Each device’s
IRQ is hardwired or set by a jumper or DIP switch.
ISA
Industrial Standard Architecture (bus for expansion modules)
SIMATIC Power PG Manual
A5E00097462-02
Glossary-9