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Glossary-6

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

Intelligent DP Slave

The defining feature of an intelligent DP slave is that input/output data is not

made available to the DP master by a real input/output of the DP slave directly,

but by a preprocessing CPU (in this case the IM 151-7 CPU interface module).

Interrupt

The operating system of the CPU recognizes 10 different priority classes that

control the processing of the user program. These runtime levels include

interrupts, e.g. diagnostic interrupts. When an interrupt is triggered, the

operating system automatically calls an assigned organization block in which the

user can program the desired response (for example in an FB).

Interrupt, diagnostic ³ Diagnostic interrupt

Interrupt, process

³ Process interrupt

Load Memory

The load memory is part of the CPU. It contains objects generated by the

programming device. It is implemented either as a plug-in memory card/micro

memory card or a permanently integrated memory.

Marker

Markers are components of the system memory of the CPU for storing

intermediate results. They can be access on the basis of bits, bytes, words or

double words.

Masse

Ground is the total of all interconnected inactive components of a device that are

not able to carry a dangerous contact voltage even in the even of a malfunction.

Master

When they are in possession of the token, masters can send data to and request

data from other nodes (= active node). An example of a DP master is the

CPU 315-2 DP.

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Siemens ET 7Y Series Especificaciones Pagina 198